Not only are tags great, they're a requirement of Web 2.0 (read the handbook). Here's a quick way to pull out those tags in a meaningful way:

class Post < ActiveRecord::Base
  has_many :taggings
  has_many :tags, :through => :taggings do
    def to_s
      self.map(&:name).join(', ')
    end
  end
end

Now, calling @post.tags.to_s will return the list of tag names separated by commas. The real magic is when you do this:

puts "#{@post.tags}"

A frustrating situation courtesy of OSX and mounted drives (over SMB in this case):

linux-host$ svn status
?      site/actions/._contact.php
M      site/actions/contact.php
?      site/conf/._controller-config.ini
?      site/conf/._nav-config.php
M      site/conf/nav-config.php
?      site/templates/._contact.php
M      site/templates/contact.php

Luckily, there's a command for that (OSX Leopard):

mac$ dot_clean .

linux-host$ svn status
M      site/actions/contact.php
M      site/conf/nav-config.php
M      site/templates/contact.php

See man dot_clean for more information. Credit to MacWorld for this tip.

Update: Since posting this, Brian pointed out that this is most likely a setting inside of TextMate. To disable, just run this command from a terminal:

defaults write com.macromates.textmate OakDocumentDisableFSMetaData 1

Do not run this using sudo if you want it to work (I found out the hard way).

Sometimes you don't want them all frozen (maybe you want to build Hpricot on your target system instead):

  $ rake gems:unpack GEM=coderay
  (in /Users/preagan/Projects/sneaq)
  Unpacked gem: '/Users/preagan/Projects/sneaq/vendor/gems/coderay-0.7.4.215'

I'm pretty terrible with the whole blogging thing, so this is my attempt to bridge the gap between the verbosity of 140 characters and a full-fledged blog post. To make this whole thing easier, I wrote my own custom blogging software - we'll see how it goes...