Wapipedia allows you to search the content of Wikipedia and view it on a modern phone. It will probably choke older WAP 1.0 based phones, but anything that can handle WAP 2.0/XHTML-MP should be quite happy.
The design does a good job of working quite well on both a mobile device and a browser. It’s a bit minimalistic in a browser, but you know what, it’s usable in both. I really like sites like that. Russ has done a few and I’ve stared (but not finished) a few projects that pull of the same thing.
I think we’ll see more sites like this in the future, unless it’s just me that gets warm fuzzies when using sites like this.