as in Sanyo/Eiki/Christie LCD series (XF45/46)
or in the actual DLP styles from Christie/DPI/Barco?
for the LCD units, that are hanging from box truss, I use a ceiling mount that uses 1.5" threaded pipe into a flat 4" stock. The stock plate has 2 altman or mega clamps on it. Quick and easy. You can run the steel safety down the middle of the pipe as well.
For the Christies (non M series) I usually end up rigging to eye bolts using a turnbuckle with a shackle on one end and a half coupler on the other side. Works well for the digitals as well.
M series have a cage but basic operation is the same.
For Barco, the SLM series have integrated rigging and work decently as long as you use pipes and cheeseboroughs to help position the clamps where you need versus where they land on the truss.
MBP 2.4 4GB Ram/FCS2
Power Mac Dual 1.8 G5/5.5GB Ram/Radeon 9600/FCS2
Aja io hd for MBP/ Aja io LA&LD for G5