Just to let you know a new project (started one month ago): LTT
the Linux Tips and Tricks page at http://www.patoche.org/LTT
Tips are collected from mailing-lists, newsgroups, sent personnally or
submitted via the Web.
They are sorted in categories, and they are searchable with htdig.
Right now more than 100 tips in various categories (network, security,
configuration, etc...) always expanding.