Too many, I have a bunch of undeveloped domains or half finished sites rather than a few well developed ones.
Right now I'm working on a major project, biggest one I've ever done in my life. There are several technical hurdles to overcome and it requires a lot of forethought to ensure that a decision made now isn't going to break in 3 months when the database throws out an error. I'm not known for thinking ahead, so I'm worried.
