Came across two cool online collaboration tools today:
Corkboard: Create and share notes online
PiratePad: This is another free tool that allows you to collaborate.
One nice feature of PiratePad is the fact that multiple people can view whats being typed at the same time. One immediate use that I see for this tool is for using it to conduct phone interviews where you ask the other person to write some psuedo-code.
Both tools have a paid and free option.