There is an interesting discussion in the Mutt community about the inclusion of the header caching patch (see for example the thread from which this summary is extracted). A bunch of people went it in, but Thomas Roessler seems to be opposed to including it.
I personally would like to see it included, but more than the actual inclusion of the patch, I'm interested in seeing how this is going to be resolved. The resolution of such issues in open source projects has always been interesting to me.
