Well, I bought a Gameboy Advance SP this weekend. I was playing around with one at the store the other day and was really impressed. The GBA now had some really good classic arcade games game packs that where pretty cheap, so I bought the Konami Collector's Series, Namco Museum and I also picked up Yoshi's Island: Super Mario Advance 3.
I haven't played around with it enough to give a full review, but I had no problems viewing the backlit TFT screen outside in the sun yesterday while at the campgrounds. There's nothing like playing Rush'n'Attack while sitting in a lawn chair lounging around at the lake on a Sunday. :) I'd like to pick up one of those "eReaders"—there's a ton more classic arcade games for the eReader which are all under $5.