Anyone know what this is?

Its an Epipremnum, but it is also known as Devil's Ivy. 

I've never had one as a houseplant, but they are pretty easy care.  If you google it, you're bound to get loads of info as they are very popular.  They are vines that grow up other trees in tropical regions so don't mind being houseplants.  Keep it away from radiators and direct sunlight though.