Chrissy - I had the implanon and totally loved it, no weight gain, a only rarely had a very light period and the bonus is that it is a very cheap option (about $50 including insertion). It isn't for everyone tho... but if it doesn't suit you, it is easily removed and your body/fertility returns pretty much instantly.

Adele & Belle - Sorry I missed you both on msn yesterday! Will catch up soon.