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Utilities – Shipping trackers and other utilities

TrackThis

http://www.usetrackthis.com/
Track Your Packages Over Email, Text message, Facebook or Twitter
No more refreshing pages. No more wondering if packages have arrived yet. With TrackThis, we'll send you near instant updates via Email, SMS messaging, RSS feeds, Facebook, or Twitter. We track UPS, Fedex, USPS, DHL and several other carriers.

twtjobs

http://twtjobs.com/
Twitter Resume

twtTRIP

http://twttrip.com/
Travel organizer

Twittercal

http://twittercal.com/
Link your Twitter account to Google Calendar.  You can add items to Google Calendar by Tweeting.

Twittad – Not Recommended

http://www.twittad.com/
Put ads on twitter profiles, and in your tweets.  This is a serious turn-off to other Twitter users.  We recommend you do not use services that alter your tweets.