I had a look round for a poker game myself but didn't find any. Only card game was Solitaire but never play that (unlike 99% of PC users it seem )
Blackjack would be cool too but my fav card game ever is shithead. Can't see it working too well on a console since the whole fun is the people you play with.
Hmm, my C++ skills are a bit limited but could try something sometime. Can't see myself getting too far though since all we ever did was little DOS programs to calculate rugby scores and other stuff.