This one-day series of events is happening in more than 185 200 cities around the world.

On 12 February 2009 175+ cities around the world will be hosting Twestivals which bring together Twitter communities for an evening of fun and to raise money and awareness for charity: water … By rallying together globally, under short timescales, for a single aim on the same day, the Twestival hopes to bring awareness to this global crisis.

Get involved, even if it’s last-minute. Check the hub site (twestival.com) for a events near you, or find out how to donate through Twitter via TipJoy.

charity: water is a non profit organization bringing clean, safe drinking water to people in developing nations by funding sustainable clean water solutions in areas of greatest need.

Don’t be put off by the title if you’re not a GTD-type person. This list is a cornucopia of services built on top of Twitter, many that I’ve never heard of until now.

After three years on the web, Twitter has become more than just another micro-blogging client. A whole industry of web applications have sprung up to extend and capitalize on Twitter’s capabilities, from the ridiculously silly, to the gobsmackingly useful. If Twitter is not already a part of your daily life, these applications can give you a whole new perspective on the idea of Getting Things Done. There’s a lot you didn’t know you could do with 140 character spurts.

Update: As someone just pointed out to me… if you thought that was a decent list, check out the Twitter Fan Wiki. Whoah.

If Twitter existed in 1937, and farmgirls had web access, this is how we would see one teen girl’s account of daily life during the Depression. Fascinating in a strange, time-travel kind of way. Here’s the back story and a few answers to FAQs from David Griner, the great nephew, who is maintaining the account. (via Biz)

Dan Benjamin pontificates on the state of blogging and longer-form posts vs. shorter Twitter-like posts. Interesting commentary toward the end that to really participate means having more than one channel or form of contributions.