I must say that you are doing dignified work.
There are some attributes that missing and in my opinion these can be great to have on N900:
1. Ability to conference 3G-GSM calls and skype call, i'm aware that a year ago there were some determinations that it can't be done, maybe with more experience like people have now it may be possible to develop.
2. sms messages templates ("On a meeting..","I'm 10 minutes late"...)
3. Ability to edit contact details from "Phone" by long press on a contact and change the functioning of "open contact card" to open the contact card as it is from the "contacts" screen.
4. Auto complete on email address (To/CC...) by the emails saved on the contacts.
5. Allow sending files via Skype to an online contact.
6. Add option to connect skype account without retrieving old messages arrive since last connection.
7. Performance optimization. for example: I guess that there is a process that writes to log file all the time, so maybe adding a parameter of logging level writing (All = 1 , Just what is "just must" = 2) can make things faster and lower the CPU.

Thank you very much!
Bentzy