SVN and Setuptools

[percious]

I have been thinking a lot about versioning and release of software
and I was wondering if what I came up with exists.

What I would like to do is create a daemon that sits and checks an SVN
repository for tags.  When it finds a new tag, it would create an egg
for that tag and upload it to an ftp site (PiPY).

Does something like this already exist?

Also on that note.  Lets say I have a version-dependent set of data
(like in a berkeley database) and In order to extract that data, I
have to retrieve a set of code from an SVN repository, stuff it in a
"working" path, import the modules I need, and extract the data.  Does
anyone have a good example of this?

Thanks a lot guys.
-chris