Why are Exported files so Large?

I import DNG files form a K20D - size is around 23MB. If I put these through lightroom and make a few edits including cropping then export the image to Tiff the files grows to around 80MB. I thought the export process was supposed to embedd all the changes in the actual picture?
I'm on V1.4 LR and windows vista
This is quickly going to give me storage problems!

>DNG is essentially luminance values only and colour comes from the inferred pixel position (Bayer Pattern)
Exactly right!
P.S. You can gain close to a factor of two in the tiff by using the lossless LZW or tif compression to get files around 40 megs. CS2 should read those fine. Then again, you can do the same thing with the dngs from your K20D. Just convert them to dng in Lightroom or dng converter and enable lossless compression and the dng should shrink to around 14MB without loss in quality.

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