First of all thanks for awesome plugin - it perfectly suits my needs. It will serve as module on the web page of my faculty for students to register for seminars. Until now that was done manualy, with some paper lists circulating around students..
I had two problems while trying to run your plugin
1) I had 'short open tag' on my local php installation set to 'off' so your plugin crashed when trying to create event - maybe it would be better to use standard tags or at least put somewhere a notice that you need to have them enabled to use this plugin
2) when solved the first issuse I still couldnt create an event ('..document not found on the server..") - I solved the problem by changing
$GLOBALS['wpframe_wordpress'] = get_option('site');
to
$GLOBALS['wpframe_wordpress'] = get_option('siteurl');
in wpframe.php
I also made a polish translation of your plugin - http://www.box.net/shared/q7urfv8rmm - feel free to do whatever you want with it (I noticed you asked another translator for his website address, so mine is http://www.jakub.chodorowicz.pl/
I have small problem with one of the po-declarations, namely
'%s' has been added to the attendee list for event %s.<br />Thank you.
Unfortunately, both in original version and in my translations the holder fields (%s) are not replaced with values, when registering to an event, do you have any idea why?
greetings
Jakub Chodorowicz