oh believe me I know the feeling all too well! I've got a ton of WIPs and I'm always starting more each day. I think right now I have 5 counted cross stitches going, 7 or 8 quilts in various stages and other projects, my newest include making teddy bears and dolls.. but ya, I know the feeling!
What I do is I have my stash seperated into piles, the NOW or oh heck ya pile, the ohh that's a good idea, or I have a good use for that, but it's not for a couple months pile, and then the, maybe someday pile. Seems to help me.