Thats an important release. Yes not a stable and complete one(0.4 is very stable), but the first usable after the large rewrite, which shows mostly all benefits we did the rewrite for. And i don't mean polishing the folding, but to have document switching without side effects. sounds normal but impossible with the hack I introduced shortly before PCE 0.2. But 0.4.2 will bring also so new features, mostly mentioned in my last post here except this two: you can choose, where the opened file appears on tha tabbar(leftmost, rightmost or left|right beside the current) and the file history will be a normal session file so if you reopen a file from history of closed files, it will be restored with all the sttings you defined for that one.
so if you like play with it, goto my treehouse. It should be also on CPAN soon.