I recently purchased Bulletproof Web Design book and I like it!
I am still learning CSS and this book take my learning to a different level. There are some techniques in the book that I actually use already (ehm… sidebar).
I am a fan of fluid website design and Dan Cederholm (the book author) shows how it can be done.
I highly recommend the book!
I’ve updated the sidebar to be a bit nicer.
I’m planning of improving my theme a little bit at a time with various techniques that I observe and learn from other websites and books.
I’m beginning to enjoy web design now. 
Update May 26th, 2008: I have posted new instructions to validate dates in Rails.
I am working on my Rails project and need a date validation in the model.
I found Validates Date Time Plugin.
According to RailsLodge Plugin page, I can automatically download the whole branch by issuing the following command:
ruby script/plugin install http://svn.viney.net.nz/things/rails/plugins/validates_date_time/
The resulting files should be stored in the vendor/plugins/validates_date_time.
Once I have more time, I’ll be sure to give it a spin.
book and I like it!