Last Updated: Sep 06,2010
I'm using the stock keyboard, and don't see the pipe symbol anywhere.
Download smart keyboard from the market, I'm not positive it has it but it is free and worth a look, I'd suggest this keyboard anyways, way better than the stock one.
Stock doesn't have it. You can download the XDA keyboard from xda-developers.com (just google xda keyboard or search this site) and that version is very similar to the stock keyboard and has the pipe key.
Latecomer I know, but this keyboard is terrific!
Separate names with a comma.