Browsing is tricky as clicking on tiny links take more work, I find I need to do a lot more zooming in on the 7".
Another advantage of many 7"-ers is they can charge from the USB port. If for some reason you also have your laptop with you, you can often plug the tablet into it and it will charge (albeit much slower than from the wall charger), most 10"-ers cannot do that.
It might be because my eyes are still young, but I prefer smaller screens with a high pixel density to larger screens with a lower pixel density.
It is because your eyes are still young.
7" is definitely a good size for tossing in a courier bag/coat pocket though.
http://reviews.cnet.com/8301-13970_7-57385378-78/samsung-gal...
Broadly speaking I don't like a the idea of a tablet with a stylus as it would be better for a small number of use cases but worse for a far larger number.
The screen doesn't handle detail brilliantly for handwriting but uPad gets round this by giving you a larger writing area which it then shrinks onto the actual document. Basically you write an inch high and it crunches it down to about 40% of that. It works pretty well, though I'd still use the keyboard for significant text input - it's completely workable once you get used to it.