UFOs and the itch to keep casting on...

So, just how many projects can you have on your knitting needles at any one time? How many unfinished objects do you have languishing around your home? 

The reason I ask, is that I have suffered a severe case of startitis this last week or so.  I have started some fingerless gloves, a jumper, a scarf and am about to cast on some barn raising squares too. I admit the gloves were also finished, and the scarf is progressing well, but I am itching to do more.... Not to mention the fact that I have some mystery spinning on the go too, for a Christmas swap. ( sorry, no pictures yet, that would take the mystery out of it....)

I guess as long as I don't run out of needles, then I'm ok to carry on... What do you think?