Yesterday we received our first HP 5745 thin client, and I'm pleased to say that it's working well so far. The onboard Intel video card supports 3D/Compiz and will not require us to add our own video cards; which will lower their price point by at least 75 dollars. Compiz is fluid and responsive and movement is crisp.
It was really perfect timing for the 5745 to arrive. I had just finished the Lenny update for the 5725s and 5735s and the build installed and booted with very few modifications. So for us, all three models will run the same operating system and have identical features. I just need to write a small amount of auto-detection code for first boot.
In the next few days, I'll take the new thin client apart and take photos of the internals. The new footprint and design is excellent; it's only 1.75 inches wide.