I was thinking about making my RPi like a music hub, that I can control from my phone. So say I'm at home and want to paly same music, I just get my phone out and select the song I want. I was thinking about using RaspBMC an Yatse but I eventually want it to be a notification centre so when a mail arrives to me it says me I've got a mail through the speakers. Does someone know any program/way to do this? Thanks in advanced.
Raspbmc is the best approach. You can use as a Music/Video hub. There are many addons to use on demand content as well. You can control with your phone using the official XBMC app.
There is a email addon, but I never use it. Google it and see if fits in your needs.
A nice feature is this notification that you spoke, if you receive a call or message, a notification will pop up in your TV.