Since i had a hard time finding this information on this forum when trying to decide whether or not to buy the mini-DVI to DVI adapter, i went ahead and bought it, and hooked it up over DVI to my RCA 27" tube 1080i HDTV... and it works! I'm using a black macbook. using the adapter, just plug it in, and go into your displays preferences. you may need to hit detect displays, but after that, the displays window on your HDTV will say "HDTV" and it will give you the option of various resolutions, including 1920 x 1080 interlaced, or 1080i. granted, i wasn't completely impressed with the quality of running a secondary display (not mirrored) in 1080i. so i did mirroring with 1280x800 (standard macbook res), and it outputs a 1080i signal with that resolution. hard to explain, i know. but it's NOT 1280x800 that gets sent to the HDTV in this mode, its 1080 interlaced!!! it just up-converts the 1280x800 to 1920x1080 much like an upconverting DVD player would. also, if you want to use front row, you'll benefit from doing mirroring. i also got the mini-optical to optical adapter and hooked it up to my 5.1 unit and just left my macbook near my TV. it's nice being able to control that across the room but those of you with 720p HDTVs or standard def TVs will never understand why us 1080i people get so excited about this! 720p just works, but it takes a certain graphics card to output an interlaced signal, since computers usually use progressive scanning.