Yet another productive weekend. decklin merged my MWM hints stuff into aewm, and we both patched rxvt to support override_redirect and MWM hints. Did two releases of xhippo, the first (2.5) adding a popup menu and playlist editing, and the second (2.6) actually making it work (well, plus various other changes). Wrote a quick hack to watch the X selection and show a window with buttons in that depend on the selection (matching regular expressions); I'll probably "release" it some time next week.
It did make me start to feel mildly infuriated with GTK, though. No X resources support; no X geometry specification support; windows don't calculate their size until they are shown...