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It’s time to kick off this week’s Faceoff challenge, wherein we pit two web services or software packages against each other in a knock-down, drag-out fight.

Last week, Windows 7 went the distance to narrowly defeat Apple’s OS X 10.6, Snow Leopard operating system. This week, with Twitter Lists on the brain, it seemed like a great time to put two fantastic Twitter desktop clients in a head-to-head matchup.

Seesmic Desktop may have already added support for lists, but TweetDeck promises they’ll release support soon as well. Both apps have been continually updated and well-supported, so much so we had to do a rematch of our original head-to-head comparison just a few short months later.

So without further ado, let’s hear what you have to say. Head on down to vote in the official poll, and don’t forget to also leave a comment and let us know why you picked the winner you did. Be sure to get your votes in by noon PST this coming Friday, November 6!

Web Faceoff: Overall Results

Week 2:
- Tumblr vs. Posterous
- WINNER: Tumblr, 1809 votes (Posterous: 1496 votes, Tie: 256 votes)

Week 3:
- Pandora vs. Last.fm
- WINNER: Last.fm, 1187 votes (Pandora: 1156 votes, Tie: 122 votes)

Week 4:
- Twitter vs. Facebook
- WINNER: Facebook, 2484 votes (Twitter: 2061 votes, Tie: 588 votes)

Week 5:
- Wordpress vs. Typepad
- WINNER: Wordpress, 2714 votes (Typepad: 267 votes, Tie: 357 votes)

Week 6:
- Windows 7 vs. Snow Leopard
- WINNER: Windows 7, 3632 votes (Snow Leopard: 3278 votes, Tie: 121 votes)