March is World Blogging Month
(WoBloMo)

What to do
Publish at least one blog post every other day from March 1 to March 31. If you do, you win. If you don't, you don't.
When to do it
Every odd day of March: March 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, 23rd, 25th, 27th, 29th, and 31st.
Why?
Because perfect is the enemy of good and nothing ensures imperfection like an arbitrary deadline. To muzzle your inner critic long enough for you to say 80% of what you wanted to say.
Why March?
December and March are two of the most popular months for web surfing. While December is fueled mainly by holiday shopping, March may be fueled by cold people reading making it an ideal time for writing.
Is this too easy?
It's not as gruelingly impossible as NaNoWriMo, but it's not trivial either if you take it seriously.
What else?
Tag your posts 'woblomo' to be counted and to excuse yourself.
Is this the same idea as NaBloPoMo?
Almost. National Blog Posting Month (NaBloPoMo) is 1.9375 times harder and not confined to a specific month. It's also a vibrant social network worth joining.