Heh, glad it's fixed (both the game and the dead pixels)
Hotel Dusk is a good game, but it has a fair amount of reading involved.
Tetris DS and 42 All Time Classics are some other good games. They're not the sort that will have you playing them for hours at a time, but you'll play them very very regularly just for short amounts of time.
---------- Post added at 23:33 ---------- Previous post was at 23:09 ----------
I forgot to say that DS games are region free, so you can get some great deals by importing games from the US and Canada and they'll work with your UK DS.
However, if you trade games in, you may find that some high street stores won't accept non-PAL DS games.