I check them on:
- IE8 (droppped IE6 already)
- Firefox
- Safari
- Opera
- Opera Mini (from my mobile phone)
- Konkeror (using a Linux liveCD)
My conclusions:
- Easier sites are the minimalistic ones.
- Using a media="handheld" css file is not stupid at all. Actually helps a lot.
- Semi-fluid sites are a good idea (like Smashing Magazine, for example).
Hope this helps and nice boobs btw...