I like IPdashboard a today plugin that provides a lot of useful information;
Full support for Windows Mobile 2003, Pocket PC 2002, and Pocket PC Phone
Edition Devices
* Historical usage information tracked for all your network adapters
individually (WiFi, GPRS, Sync Cable, Ethernet, and some Bluetooth Adapters)
* Graphical or tabular display of network usage information over hourly,
daily, and monthly timeframes
* Network usage information can be exported to a spreadsheet
* Special Phone Edition features, including display of voice network status
and mobile operator name, and a more detailed signal strength readout
* Save and Restore IP Dashboard settings for instant backup and recovery of
your configuration
* Better Today screen integration with programs such as Icbar

http://hudsonmobile.com/products/ipdash/documentation.html

Also if you need a battery program, this one happens to provide a lot of
good info too.

iPAQPanel 2003 System & Network Monitor by RhinoCode
a.. WiFi network monitoring - a first for a Today Screen Plugin

http://www.handango.com/PlatformProductDetail.jsp?productType=2&optionId=1_2_2&j
id=442A6CFD539973831XFBCA9BB4A356E3&platformId=2&siteId=1&productId=21757&sectio
nId=0&catalog=30&txtSearch=rhino