There is a new version of MemSkin+ up at the download page. This version has support for skin reloading in Windows Live Messenger 8.1.
Hopefully from here on out the skin reloading should not need to be updated for each Messenger build.
On a separate note, now that Messenger Plus! Live 4.10 has been released, you can use MemSkin+ and MsgPlus at the same time with no problems.
