High Dynamic Range

First, a disclaimer. After 23 years of PC use, I converted to Mac only two months ago (why didn't I do this years ago???). I am a photojournalist and am now heavily into using Aperture, which I L-O-V-E. What I'm trying to say here is that I'm a newbie!
Question: Is there a way to combine 3 bracketed images to create one High Dynamic Range (HDR) photo within Aperture? If not, is there a software add-on or plug-in that I can buy for Aperture to accomplish this? I also use Photoshop Elements 4.0 for Mac as my External Editor, so do I need to use something for PSE to accomplsih this?
Any help would be greatly appreciated.

I didn't think it was too hard, but I don't know how others would find it. I think you can download it and use it unregistered with a watermark to test it.
Basically, you export your 3 (or more) images from Aperture using 16 bit tiff. Then drag them into Photomatix. You can then have about 5 different ways to convert an image, but there is only one that I really bother with most of the time. I have it generate an HDR file from the 3 tiffs, and then use "details enhancer" under "tone mapping". You'll have a few sliders to play with to get it how you want.
Here is my favorite I've made, I used 5 exposures (-2,-1,0,1,2)
http://homepage.mac.com/cookiemonster/fallconference2006/large-11.html

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