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For Christmas my wife bought me this kit from qkits.  http://www.qkits.com/serv/qkits/diy/pages/QK145.asp

It does involve soldering although I do believe you can buy one assembled for a bit more money.  A bit of computer skills will help too.  I downloaded a little utility at http://quozl.us.netrek.org/ts/ to get the temps and I then wrote a script (Linux) to update Twitter and insert the temp into a MySQL database.  I use cron to run the script.  You can do it in Windoze too, er, good luck with that.  I did find this Windows utility that tweets from the command line, but I have not tested it, you can download it at http://phalacee.com/index.php?page=development&section=app&development=19