most used way to allow push

[ibn at ikeeper.cn]

what's the most used way to allow push ?
hg serve? 
with ssl or not?
anonymous push?
CGI?
mod_python?

as Distributed version control system , people can work without push.
but sometimes push is useful. I think at least one person should push.

found this:

Matt: you'd probably keep a single push point
... commits have to be single-threaded
... hg backend uses lock-less pull
... multiple readers, one writer
... so no lock contention
... e.g. dev{1,2,3}.w3.org could all pull from a backend server, push.w3.org
... pushes would all go to push.w3.org

I use a Mercurial  plurgin for Trac to view source, but it can only view, not push or pull.
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