I use Panasonics at school and I've used lots of the Canons. while I haven't used lots of Sony's say, outside of the store, I have seen lots done with them.
The Canon ZR series camera are my favorite for under $1000. They're smaller than compant camcorders but larger than micro ones. I like them. Sony's are OK but the cheap ones are big and the expensive ones are expensive, Panasonics are just plain bulky.
If you've got a limited budget go with the Canon ZR. If you're in a splurgy mood go for the GL1 of XL1
