I'm primarily looking for the remote control II app, or something similarly functional, but if anyone else has anything they'd like to recommend as essential for this phone, I would be interested to hear it.

I've been using this series of phones for a few years now (Had a C500, C550 and a C600 - like the 550 best for its balance of features) it pretty much runs my life, (well outlook does, and having outlook on my phone allows me to leave the house)

I'm not convinced I need a PDA, but I think theres probably more use I could get out of this phone