A new version is now available both as a windows exe (download the zip and unpack it) and as python source for Mac and Linux. This new version seems to fix several reported bugs, so if you've been having problems give it a shot.
Cockatrice can fetch card images from the net easily, as long as the corresponding entry in cards.xml has a url for the card image. To support this in magicHack, we now simply allow for url entry for image locations. This is now deployed in the Windows download.
I just sat down to take care of a bunch of tickets and found out that magicHack doesn't work on my current system :( I installed an older version of python (2.6) which is what I actually used in developing the program and then it worked. This is annoying and probably my own stupid fault for coding something in a dumb way. I'll have to figure this out before fixing those tickets as this is a pretty big bug.
magicHack just hit the 100 downloads mark. I'm feeling pretty good about that. I'm really glad so many people have found it useful :)
Another magic hacker I met through the mtgs website has successfully installed and tested magicHack. This probably means I can release now but I'd like at least one more confirmed success.
About a week ago I decided I really wanted to be able to easily export sets from MSE into a database compatible with Cockatrice to play games with custom cards online. I first proposed the idea on this MTGS forum thread. After learning a bunch of regular expressions and xml parsing stuff I have a working version. The program can read cards exported by MSE into memory as Card objects which can be sorted and edited in the python interactive session. Cards can be grouped into CardSet objects which can then be exported to your local Cockatrice database file. There are still some known failure cases which I'll be working on, as described in the code. For instructions on use see the wiki (soon).