Free Space Tool
Monitors your PC's drives and shows you the available space for those you've selected.

Download: http://gallery.live.com/liveItemDetail.aspx?li=17b251a1-4970-433c-9e3d-ad209b0ecd40&l=1

Uptime Tool
Find how much time has passed since you last restarted your computer.

Download: http://gallery.live.com/liveItemDetail.aspx?li=9edd60d7-5810-44b4-a72e-b3416de5758b&l=1

Multi-Meter Tool
Cpu usage % ( 2 cores ) - Ram Usage % - Ram info ( Total, used, left size) - Status bars animated above 90% - 100 Skins + background selection

Download: http://gallery.live.com/liveItemDetail.aspx?li=f5b13626-b266-4334-b2e5-157bd66ca5af&l=1

Battery Level Tool
Monitor the battery level of your laptop.

Download: http://gallery.live.com/liveItemDetail.aspx?li=08391e8d-39b4-4766-bab0-7ba3c487c0aa&l=1

Wireless Signal and IP Address Tool
Displays your wireless network information such as it's status, signal strength and security. This also displays your internal IP and gives you a direct link to your router's / wireless gateway's web based control panel.

Download: http://gallery.live.com/liveItemDetail.aspx?li=2b4caa88-9b88-4a33-8624-c5d204f27849&l=1

All the above tools are free to download from Microsoft.