LR3-Library-Export-Image Resizing: Specifying Pixel WxH results in different WxH - tips please?

This is a multi-dimensional question (he he). I understand my problem is related to the original/developed WxH ratio. If the pixel WxH I spec in Export-Image Resizing doesn't match that developed proportion, the results are not what I want. In other words LR3 keeps the original/developed proportion and not what I want for that export. Ok, so I just answered my own question - but..... please give me some library or export tips for doing what I want to do.
What I do:
1 - I edit my images in RAW and like to keep them in their original proportions from my Canon camera as that is the proportion of HxW i use the most
2 - Later, if the image is really good (at least I like it), I may export it for different purposes and then may choose or require a different proportion.
3 - I would really like to not have to re-crop in Develop, then go back and Export, then go back to Develop and change it back to original.
Besides being tedious and time consuming, can anyone recommend a better way for me to do these "one off" exports (seems to happen more often lately) without screwing around in Develop and messing up my original work?
Background:
One of the reasons I do this is to create wallpapers for computers, for various printing/framing proportions, and then for web site situations. Windows XP (and I think the others) gets really slow if the program must re-size an image for wallpaper (why? go ask Mr. Gates... better get in line). So to keep performance high, it is best to create the image in the exact pixel dimensions of the monitor. This is always some weird number and not like anything else I do this for. The other reason is for a quick, custom print job for someone who wants an odd matting setup for framing (don't ask). This results in odd proportions. Regarding the web.... well smooshing a pic into a column etc. etc... Now while I am proud of my art and understand LR3 will expect me to re-crop to preserve my artistic brilliance, but really..... I would be happy with a proportional crop from the parallel sides of the offending dimension.
Also, when I spec a dimension, shouldn't the DPI gray out? What am not understanding here?
One last request: please give me tips on solving for world peace... this one really bugs me.
Thanx in advance!

Bruce,
As you correctly noticed, the WxH ratio in export represents a canvas, into which the exported image is fit. Here are some illustrations on what the different settings mean:
For what you are trying to achieve, you have to crop the image to the correct dimensions before doing the export. If I had to do it, I would create virtual copies of the original image as the last step and give each virtual copy its own crop, then export the virtual copies.
Bruce in Philly wrote:
Also, when I spec a dimension, shouldn't the DPI gray out? What am not understanding here?
The DPI resolution has no meaning for the size of the resulting image if you specify pixels in your export dimensions. But the resolution tag is written into the image, which might affect the way an image is printed, depending on the printing application.
But if you specify your export dimensions in inches or cm, the resolution together with the dimensions in inch/cm determine the size of the resulting image in pixels. I.e. if you specify 5x7" and 300DPI, your exported images size will be 1500x2100 pixels.
Beat

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The things i want included past develop are these: image resize, local sharpening (and blurring - after image resize) smooth border capability (with choice of color). One way of course is to export to PSE8. I expected more from LR3, though - rather than just 2/3 of a job for 3 * the price.
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2) smooth border capability (with choice of color) - This can be done using LR's 'Slideshow', 'Print', and Web Modules, choosing the one most appropriate for your target usage. NO, it is not the same methodology as Photoshop, but it does a very nice job on the majority of "digital camera image files." LR also offers multi-media functions that are unavailable in PS.
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vividdesigngirl, I apologize if my message has offended you in any way. That was not my intention and I really wanted to help you, I was pretty much sure and still believe that what I said is the only ways to get the results you reported not because I'm judging you or anything like that but because I don't know how else one can get the results you reported. Also if it is not obvious English is not my native language and I may have failed in using it properly. Again apologies for anything that sounded offending.
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edit: Oh, wait
vividdesigngirl wrote:
...I accidently thought the question was how big my artboard was in pixels not my exported image. ...
you mean you artboard is 576 by 360 as measured on the rulers in Illustrator? And thus your book which fits in it? OK, I get it. The pixels unints on the ruler and in the transform controls are used only for the default size if you use Save for Web and Devices but as I said, you can change them in the Image tab.
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edit 2:
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Guys, i want to ask on how to resize the images into 1200 pixels wide?

Guys, i want to ask on how to resize the images into 1200 pixels wide, how to do it? and what are the step by steps on doing that? thank you!!!

See this link: http://forums.adobe.com/docs/DOC-3691

LR3-Library-Export-Image Resizing: Specifying Pixel WxH results in different WxH - tips please?

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