Got my DS Lite yesterday with Metroid and New Super Mario Bros. must say, I'm very impressed, not only is it an incredibly sleek looking piece of kit, but these games are fantastic.
What they lack in graphical flair compared to the PSP's games, they more than make up for in sheer fun. They really are great to just pick up and play, or if you want to sit with it for hours on end they're good for that too.
I plan on acquiring Animal Crossing very soon so hopefully that will be good, especially with the addition of Wi-Fi online play

Peace out