One of the neater things I saw at CES was the growing ecosystem of cool Universal remote controls for Windows XP Media Center Edition 2005 PCs and all of your other home theater equipment and beyond.  In particular, four caught my eye:

Philips Media Center Control Panel
Covered on BlueFi, Philips new "stick" style remote control will operate all of your home theater equipment and includes the signature "Green Button" for controlling your Media Center. But what really makes this IR-based remote unique is the LCD display which enables you to effectively run your Media Center with the TV turned off.  You can browse through your music library, browsing and queueing up as you go along right on the device.

Philips RC9800i Wi-Fi Controller
Based on the RC9800i design discussed here, complete with Media Center support and the Green Button in the touchscreen UI.  What makes this one even more unique, on-top of being Wi-Fi based, is the fact that it's also a UPnP-enabled client which means it can also be a Digital Audio Receiver.  Just plug the charging cradle into a stereo and enjoy.  The scenario for me would be taking this little gem outside and plugging it into some good speakers, streaming my music collection back from my Media Center PC.  There are a number of additional applications including home automation and control. SRP is $499US.

Logitech "Next Generation" Harmony Remote
I personally use a Harmony 688 however I prefer the button layout of the 680 as it's more conducive to Media Center.  But what's missing is yep, you guessed it- the Green Button.  Logitech acquired the original developer some 8-9 months ago and at CES 2005 announced a new "Next Generation" Harmony Remote designed for Media Center 2005 PCs which will include the Green Button and a custom button design for Media Center users that doesn't sacrifice functionality. (I prefer tactile remotes where I can control them without looking at a touchscreen personally.) I've been impressed with Logitech's "Smart State" technology that automatically keeps track of the on/off state of all your devices, provided you use the remote exclusively for controlling power to the devices.  I also like the Internet-based setup and hourglass style of the ergonomic design.  It's the closest I've seen to TiVo's "peanut". (Yes, I was a first-generation adopter of TiVo too and like their design). You can read more here.
Note: Image is of the Harmony 680. 

Niveus Pocket Remote
Designed for Windows Mobile-based Pocket PCs, the Niveus Pocket Remote software enables the Pocket PC to communicate directly with any Media Center PC, allowing users to control their Windows XP Media Center Edition 2005-based PC remotely, including music playback, navigation, and recording television. While I haven't played with this one yet, I hope to soon. You can read more here in their release.

I'm sure there were more I missed.  Feel free to send me links.  I'm sure we'll be adding these to the Media Center Wiki as they come out.