- Better battery life than the 3GS
- Solid construction
- Excellent touchscreen
- Good signal where other Nokias used to lose signal
- Stereo speakers
- Fully featured browser (even though it's crippled by slow rendering, crappy interface, no back button, random crashes)
- Phone app makes calls fast
- Customizable desktop
...etc.

Huge step in the right direction for Nokia...but far from the top of the market.