I've talked to the people at Slingmedia several times about making a Maemo version of SlingPlayer Mobile. They haven't shot down the idea, but it's a low priority for them.

And let me second (or third) the positive comments about the HAVA player. It works amazingly well, and the large screen on my N810 makes watch TV a pleasant experience.

If you have an IT, I'd suggest you sell your Slingbox and get a HAVA.

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Ed Hardy
Brighthand.com