It didn't impress me at all. Most of the visual effects I could achieve with WindowBlinds; I'm running IE7; WMP 11, and now Office 2007 Pro Plus on my WinXP system (that looks like OS X, replete with icons, top-positioned bar, rollback, and the dock)
Though because of my system, I had to run it in QEMU.
A few other things I'm also putzing with:
-Codewave MyTunes RSS: The ability to remotely access my iTunes library with a web browser.
-Songbird Player: A multimedia player based on Firefox/Gecko.
-Tor/Privoxy/Vidalia: Anonymizer using onion routing, developed in part by the U.S. Navy.
Forgot Sheepshaver...8^)
The ability to run an install of Mac OS classic (from System 7.5.2 through OS 9.0.4)
Currently run OS 9.0.4 on a 1.25GB image file. Now if I can find a copy of Office 2001 for Mac, I'll be in business...8^)