I've only recently discovered this forum - and it appears to be one of the better BMW forums around.
I've owned my 2006 118d SE, 5 door for 2 years exactly - picked it up on 1st October 2008!!!
I've done a few simple things since getting the car. I've fitted a Parrot CK3100 and the connects 2 cable to enable the steering wheel controls, a stubby aerial and M-Sport gear knob.
More recently I ditched the runflats and fitted a set of Falken ZE912's which has given me a more comfortable ride and more grip in the wet. I've also sourced an E46 spacesaver which I've fitted into a mountainbike wheelbag to keep it all tidy in the boot.
My Wife also as a 118d SE, but hers is a coupe in Crimson Red. All standard apart from me fitting a Parrot CK3000 evo and connects 2 kit.
I've already used the info from the forum and am sure I will continue to do so.