There are, at least for me a couple of things I'll have to find replacements for.

1. battery monitor
2. screen dimming/suspend scripts
3. good multi location wireless manager (knetworkmanager like)
4. replace epiphany with iceweasel (better UI and configuration IMHO)
5. A way to right-click.

On the n810 Some of the above may be easier to solve, but on an n800, or even *gasp* a 770 #5 can be mighty important. All this is just me ramblin' so take it as you will. Also, has anyone else noticed that inn Debian the keyboard doesn't ssttuutteerr?