Are there any sites or apps that allow you to enter your card collection and construct a deck?

Thanks.

http://www.cardgamedb.com/

http://www.agotcards.org/deck

http://www.tradecardsonline.com

yeah that guy named all the deckbuilding apps. I'll add one other program though because it's the most important of course.

OCTGN is a platform to play online. I was sceptic at first but it's suprisingly well made and playing online is so much more convenient that playing with physical cards.

http://www.fantasyflightgames.com/edge_foros_discusion.asp?efid=16&efcid=4&efidt=814272

For german speaking fellows there is also this one: http://deckbauer.telfador.net/