Setting up GMail on W880i

Using these settings, I can send and receive email once internet was enabled on the phone. I set it up so that it doesn't check automatically.

Internet on W880i

Went to Sony Ericsson site and got settings sent; installed, I get internet on the Solo 20 tariff from O2.

But it's a bit slow, I think it's GPRS not 3G.

There are settings for O2 given here, and instructions on putting settings into the W880i here. I haven't checked that these are broadly the same as what getting the settings from SE achieved.

Tried to connect mac through bluetooth but didn't get it to work.

Ogg doesn't play over Airtunes

iTunes doesn't stream ogg over to the Airport Express. There is a bit of software which can do it though, for $25:

http://rogueamoeba.com/airfoil/mac/ 

Once again, MP3 seems to be the best choice - with hindsight.