I'm still sticking to my 'one game at a time' rule for now.
It seems to be working. For the past few days I have been enjoying a bit of Mario Kart Wii on single player and online, which is great fun. I plan to keep on playing until I complete all the single player bits, but if that's taking too long and I get bored I will buy a new game, and play Mario Kart Wii alongside it. The new games I am interested in buying are:

A Boy and His Blob (Wii)

I read about A Boy And His Blob on the Wii not long ago in the Official Nintendo Magazine.
I'd never heard about the original version, but I thought it looked lovely. Not only does it look
like a really fun game to play with an ideal difficulty level, but the graphics are gorgeous! The
cute artwork of this game is the perfect game for me to buy right now. It will be probably give my Mum
something to play on the Wii as well, other than Animal Crossing

Muramasa: The Demon Sword (Wii)

I recently found this on Gamespot and was delighted to find out about it just before the release date.
I really love the artwork and the gameplay looks great. I heard on the video review that it can get a bit repetitive, however that won't put me off it, as I am fine with that kind of flaw normally.