Just adding my 2 cents to this thread...
1) Bough this HD20 projector at centraldigital, was worried about bad reviews (seller) but it worked out well. They promised to throw in a 6ft HDMI cable but didn't.
2) Connecting video via HDMI using powered 1->2 splitter. Was planning to split the signal to both LCD TV and HD20 but apparently it is not working well since my TV is 768p native.
So I ended up outputting TV signal to my LCD TV via Component and to HD20 via DVI-HDMI (freaking cable box does not have HDMI).
From HTPC, I am outputting both to LCD TV via VGA (768p) and to HD20 via HDMI (1080p60). (dual-screen output).
3) I use my HTPC as a source for both blue-ray and all other content:
($49.99) CASE ROSEWILL|R379-SM RETAIL - Retail
($89.99) MB ASUS M3N78-EM AM2+ GF8300 RT - Retail
($58.50) CPU AMD|A64 X2 4850E 2.5G AM2 R - Retail
($39.99) MEM 2Gx2|GSK F2-6400CL5D-4GBPQ R - Retail
($119.99) HD 1T|WD 7K 32M SATA2 WD1001FALS % - OEM
($119.99) BD/HD-ROM COMBO LG|GGC-H20L SATA RT - Retail
($14.99) WL ADPT ROSEWILL|RNX-G300LX 54M RTL - Retail
I watch all content with Media Player Classic x64 version using FFDshow x64 or built-in in videocard AVC and MPEG TrueHD decoders. 10-20% CPU utilization when using built-in HW decoders, otherwise up to 100% for badly coded HD content (weird frame rates, subtitles, etc.)
4) My videocard outputs DTS/PCM/etc. sound via HDMI, so I run this HDMI thru my Sony 5.1 receiver. Blue-rays rarely have 7.1 sound, so I guess 5.1 is Ok. Neighbors already complained once, first time in 2 years, when I watched Shoot'em up
5) My projector is not ceiling mounted yet, still thinking about it since I rent apt. For now, I just keep it on the carton box on the floor. It warms up the room better this way
Seattle summer has been cold so far. Repositioning and refocusing is not an issue, I just project a rectangular Window from my HTPC and try to match it to the 4 small dots on the wall
6) No screen yet, just a bare white apt wall, ~120" diag. Image looks great to me, especially in the dark. Watching movies like LOTR during daytime is painful, because my windows are huge and face south - standard apt style blinds don't work well. Watching sports is Ok, I just increase brightness for that.
The verdict is, if you are in the same situation as me: small apartment, no good light-control, etc., switching from 768p 32" LCD TV, you will be very pleasantly surprised by the quality of this projector and what you can do with it !!!