SWFUpload issues, source code, and downloads are hosted at swfupload.googlecode.com
Information about the SWFUpload SVN repository can be found under the "Source" tab at Google Code.
SVN Clients
This outlines some of the clients that are available for subversion usage...
Windows
Macintosh
Linux
Website
The SWFUpload website is currently hosted and maintained by Rob Loach. If you have any ideas of how it could be improved, please feel free to create a topic on the forum.