This free plugin for the Firefox browser enables you to record surfing activity. You can also export the recordings as XML files, so it's possible to share recordings with other people or archive them.
I've only begun to play with this, but it seems to have great potential. The tutorials focus on using Dejaclick for other purposes, but I can see this as a great way to record website interactions on the cheap, or conduct remote usability testing.
Dejaclick by Alertsite - info, tutorials and support
Dejaclick Firefox plugin page - including user reviews