50,000 Words in a Month
November is National Novel Writing Month. The challenge is to write 50,000 words in that time. Whether it's brilliant or dreck (or brilliant dreck), your novel-writing efforts are welcome.
From the FAQ: "People looking to write classy, complex novels should not participate. People looking to get extensive feedback and people who take their writing very seriously should also go elsewhere. Everyone else, though, is warmly welcomed."
If you've been mulling over a novel for a while, this might be your motivation to actually do it.