The TG games are by far some of my favourites by Nintendo.
Obviously, the Wii series of games plays into it - making Wii Sports Resort one of the best out there, in my humble opinion. However, the line of games I adore would be Planet Puzzle League, Hotel Dusk, 100 Classic Books Collection, and, of course, Brain Age.
What TG games do you own?
http://en.wikipedia.org/wiki/List_of_Touch!_Generations_titles
Endless Ocean 2 isn't included on that list, but it counts.
Tetris DS is the only one I own D:
I have Brain Age, EBA, Nintendogs and Wii Sports
Panel De Pon
Even though I only borrowed it from a friend, the DS version is pretty darn sweet. (Despite being Japanese and getting rid of all the awesome characters)