Here is a link to a great cheat sheet (or reference card/sheet, whichever you prefer to call it):
http://www.cs.put.poznan.pl/csobaniec/Papers/svn-refcard.pdf
These are great to have around your workarea when you work with SVN a lot. Obviously, the best resource for SVN info is the Version Control with Subversion, which has detailed information on all svn commands:

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