One of the things that worries me with the Symbian platform is its compatibility running popular Windows applications.
In particular, MSN Messenger and Skype.
I am happy to inform that both applications should work on the E90 using this third party software, Fring.
It has already released support for the N95 (which uses the same S60 V3 FP 1 as the E90).
Specific support for the E90 hasn't been released at time of writing (Possible changes includes screen size tweaking and dual display for E90's massive internal screen). Yay !