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Also quite useful is the "Builds" tap on the top section of the screen once you're looking at a project page. You can see the history of builds and the result, and examine log files. Be careful looking at the "Result" page, as the default link is the "Delete" button, and there's no confirmation requested before blowing away the build report.
Note that we expect to transition our build server to the [Atlassian Bamboo|http://www.atlassian.com/software/bamboo/] technology in early 2008, for better integration with our wiki and Jira installation; it is expected to provide all of the same functionality and more.