Brian’s Guide to Solving Any Perl Problem, a neat guide to solving Perl scripting problems.

Apple’s very own guide for Optimizing Web Applications and Content for the iPhone.

A very complete guide to CSS float theory, including descriptions of many common browser bugs (mostly IE) and workarounds.

The Stephen Downes Guide to the Logical Fallacies. A short, organized list.

Are you choosing your words carefully? The Economist lists common word abuses in their online style guide.

The official set of online Rails manuals, including a Rails cookbook and a good guide on Rail’s URL routing/rewriting. The docs for a user login plugin and an overview of plugins in general.

All about Rails ActiveRecord associations (an a forum example). A useful set of diagrams and keywords showing how to associate things in Rails migrations.

The Poignant Guide to Ruby, a humourous guide to Ruby.

A full guide to using Perl for one-liners.

A handy OpenOffice guide for using master documents.