I usually use CVS as the revision control system with Eclipse.  Recently, I tried using Subversion via the Subclipse plugin.

Hooking up to a Subversion repository takes a bit more attention than doing so with CVS.  Here are the steps:

1. Download Subclise from http://subclipse.tigris.org/
2. Use the Help > Software Updates > Find and Install feature of Eclipse to point to the downloaded ZIP file as an "Archived Site."
3. Also check "The Eclipse Project Updates," as Eclipse will probably complain that various dependencies are needed.
4. Choose the appropriate features to make the error messages go away.  I wish Eclipse had a feature to auto-select auto-dependenices.  This is a pain!
5. Download putty and puttygen:  http://www.chiark.greenend.org.uk/~sgtatham/putty/
6. Follow these instructions to generate a public/private key pair for SSH so you can login to the Subversion server without a password:  http://silenceisdefeat.org/wiki/index.php/SSH_Key_Authentication
7. Configure svn+ssh connections by following the steps here:  http://subclipse.tigris.org/servlets/ReadMsg?list=users&msgNo=3334
   IMPORTANT:  Don't put spaces in the paths you specify (use 8.3 names if you have to), and make sure you use forward slashes, not backslashes!  Changes you make to the file take effect immediately; no need to restart Eclipse.