I read this inonPlanet Lisp:

William Bland just keeps on improving lispdoc, his online Lisp documentation search utility. The utility has a lot of neat features:

• A search brings up links to both the CLHS and key CL books and also provides a usage example.
• Content is provided from Practical Common Lisp (PCL), Successful Lisp, On Lisp, the HyperSpec, and the docstrings of SBCL (and, soon, from CLtL2 as well).
• Example code is from Practical Common Lisp, PAIP, ANSI Common Lisp, and a bunch of ASDF-installable libraries.
• There is a Firefox plugin that lets you do searches easily in Firefox.
• There is an htmlize utility that lets you input a snippet of lisp code and get a colorized HTML representation of that code (convenient for quickly getting something that you can put in a web page).
• It provides documentation lookup for a lot of commonly-used CL libraries.
• You can input search terms in a manner similar to SLIME’s “fuzzy-complete” (e.g. – if you enter “m-v-b” in the search dialog, it returns the documentation for “multiple-value-bind”).