Running the Windows edition of Unison has a problem.  Synchronizing small sets of files works nicely.  Synchronizing large file sets (hundreds of thousands of files and about 30 GB) will just stop sometimes.  The client says that it is waiting for updates from the server.  The server side isn't doing any I/O or burning any CPU (per task manager).  It just sits.

Astonishingly, some sites reject Internet Explorer 7 as out-of-date, but they accept IE 6.  (Lazy coding, I suppose.)  Microsoft has a utility to make IE lie about its version, but it runs as a wrapper around IE, setting the UA in the registry, running IE, and then setting it back when IE exits.

There is a spiffy browser extension that lets you change the user agent on the fly.  See http://www.enhanceie.com/ietoys/uapick.asp

While you're there, he's got other good tools, like SlickRun.