Lots of links:

Some nice and free icons.

A very simple and nice calendar generator for Ruby on Rails: CalendarHelper.

Date class in Javascript.

Putting REST on Rails

Another calendar for Ruby on Rails CalendarHelper. This one interfaces with a fancy Javascript Calendar from Dynarch, pretty big, but does lots of neat things.

Curing Float Drops and Wraps

Fixing the IE Float Drop Bug

Centering a block or image

Rails geocoding and Google Maps

Create your own AJAX effects - From Thomas Fuchs himself.

How to quickly do authentication with LoginGenerator.

LoginGenerator



Some very nice pictures of Rainbows.

Star clusters in the Small Magellanic Cloud


Some links for uploading files with Ruby on Rails:

Tiny File
file_column
HowtoUploadFiles from the Ruby on Rails wiki