Depending on what Toady's wishes are, this suggestion may be considered pretty inconsiderate. Apologies in advance.
Some people might know about the Subversion repository system: A collection of files can be put onto a special server, from which many users can download in a special way that is especially suited for files that undergo many, many revisions, like DF. I've been looking at the development logs, and I'm fascinated. Perhaps if Toady is not against the idea we users can help set up a repository for him so people who wish to test the very newest features outside of official releases can do so.
The short version about why SVN is better than a plain download is because it's so convenient. The server tracks file changes and which files are changed, which translates to much, much shorter downloads and much, much easier updating. When you update, ONLY the files that have been changed are downloaded. Depending on what we'll be using this for, you may be avoiding 50-Mb downloads, instead just having to download a few hundred Kb. Users running a *nix system (Or a Mac) can simply type "svn checkout [url of SVN repository] [destination directory]" into the terminal and get the newest revisions, and updating is equally easy, simply type "svn update" when in the relevant directory. Worry not, Windows users, TortoiseSVN makes it even easier with a GUI, just right-click a folder and select "SVN Checkout" once you've installed Tortoise, enter the link, and everything gets done for you. Updating is similar, right-click and select "SVN Update". You can even update select files or directories, so for example if there was a userbase-created data repository you could get just a specific type of data or just update one file you needed.
What's everyone think?