Spurl.net is a free on-line bookmarking service and search engine. It allows you to store and quickly access again all the interesting pages you find on the web from any Internet connected computer. It appears to be off-line as of 2013-03-02.
This is a collection of information (mostly links) about (Common) Lisp, using a system written in CL. While I am far from understanding it, I think that valuable ideas can be found here.