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Review the 2.5.x Fixes to merge filters in JIRA (http://jira.sakaiproject.org) (there are both verified and unverified filters). Verified should be ok to merge but check the comments for evidence that there actually was testing and for and any possible issues/dependencies. Unverified will need some more testing before they are considered safe to merge.
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Using the 'svn merge' command is very similar to using 'patch' above. You will need to know the commit revisions associated with the fix. The best way to find them is to look in JIRA (http://jira.sakaiproject.org). If the developer correctly references the JIRA Key (like SAK-2332) in the commit comments, then the commit comments and affected files will show up in jira under the 'subversion commits' tab.
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