I got the wi-fi only for a few reasons:
- I used mobipocket on a cellphone for a couple of years and only purchased one book via the cellphone.
- 3G coverage can be unstable in areas and irritating to use.
- I don't plan on buying many books from amazon (I almost got burned on my mobipocket purchases, luckily there was a way to strip the DRM)
- I do have the option of connecting the kindle to my netbook and use that for 3G access.
- Using the 3G shortens batterylife quite dramaticly.
- The Wi-Fi only is a couple of grams lighter.
- I figure the less thechnology, fewer things can be broken.
- I try to avoid feature-creep when buying new gadgets and computers, because I'll replace them soon enough anyway (Although fear of loss is hard to resist).