Twittercal

TwittercaI is a free service that connects your Twitter account to your Google Calendar. Using the Twittercal service, you can easily add events to your calendar, just by using Twitter. Using Twittercal is simple: just add gcal as your friend and grant it access to your Google Calendar account. You can begin using it right away just by sending a direct message to gcal. Example: d gcal meeting tomorrow at 2 PM.

Tweetl for Short URLs

The URL-shortening service from Tweetl cuts down long URLs for tweeting. Tweetl also has some other features that make it more fun than the usual shortening service. With Tweetl Preview, for example, you can preview a Tweetl URL by typing preview.tweetl.com/[id]. Tweetl Stats lets you get detailed info for any Tweetl URL. And much more! Tweetl also lets you add a description after the Tweetl link by first adding a "?" then your text.

Twitter Makes Appearance on CSI

Twitter, as a crime-fighting tool!

Blogtips via Twitter

A Twitter account at twitter.com/blogtips provides links to one or two blog posts or articles featuring blogging advice or tips every day.  The blog tips include advice on general blogging advice, blog promotion, and also making money online.

Twitter Fan Wiki

The Twitter fan wiki was created in absence of an official wiki by Twitter. The community came together to share scripts, apps, ideas, and more all at one spot. To use the wiki, just login with the password tweety.

Twitter Timer

You can use Twitter timer to have Twitter remind you of things you need to do. Timer is a Twitter bot that lets you set an alarm by using Twitter’s direct message feature. To use Twitter timer, add timer as your friend, then send a direct message to timer (see below). Timer will then tweet you back when the number of minutes you specified has passed. The minimum number of minutes you can enter is 5 minutes.

If you’re sending a direct message via SMS/Twitterific, use the format below (if you’re using Twitter’s direct message interface, you can leave off the "d timer").

d timer [# of minutes until reminder] [your message]

Example: d timer 60 check parking meter (will remind you to drop a quarter in 60 minutes)

TwitterWho

 TwitterWho is a people search service provided by the same people behind FormSpring, the popular online form builder. The search makes calls to Twitter’s people search form found at http://twitter.com/invitations, but lets you enter multiple queries at once so you can find people more efficiently. With TwitterWho, you can easily find people who have signed up for Twitter, without having to send them all an invitation to use the service, only to find out they already are!

Tweetr

Yet another Adobe AIR app is Tweetr.  The killer feature of this app is that it lets you snap pictures from your webcam, or upload files by drag-and-drop. The app then creates short URLs that you can send right out to your Twitter followers. The latest version lets you choose between urltea.com and urlx.org or none for your urlshortening service and runs much faster!

Spaz

Another Adobe AIR application is Spaz. The app is an open-source client that works on Mac, Windows, and Linux. The interface has tabs for your timeline, direct messages, replies, and a list of your followers and those that you follow. You can download Spaz for free here.

Twitterposter

Although not a service, Twitterposter is a cool mashup you really just have to see. Twitterposter is a graphical representation of the users on Twitter.  The service generates a mosaic with the images of users who have a greater number of followers in Twitter. The application was created by Come’n'Click Networks, S.L. You can follow Twitterposter on Twitter by joining the Twitter group, http://twitterposter.com/group/twittmad .