Ok, I just got back home and finished importing it all into an Anki deck and it worked 100%
What I did was download the mono version of subs2srs from the link on the first page then:
1. Download and install Mono from
http://www.go-mono.com/mono-downloads/download.html
2. Download ffmpeg from the link Asriel provided
http://www.megaupload.com/?d=ZBU4FM3M (perhaps you might want to package this with the download? As a layperson I found it very difficult to find despite much googling. Thankfully Asriel rode to the rescue)
3. Put the ffmpeg file in /bin. You can get to /bin by opening Finder, selecting Go from the toolbar, then select Go to folder and type /bin (pm215 mentioned this might not be a good idea, but I don't know how to add other directories to $PATH. I don't even really know what PATH is)
4. Open terminal (found in Applications-->Utilities)
5. Type "chmod a+x /bin/ffmpeg" (without quotes) into the terminal, then press enter
6. Type "export MONO_MWF_MAC_FORCE_X11=1" (without quotes) into the terminal and then press enter
7. Type "mono" (without quotes) in the terminal, followed by a space, and then drag the subs2srs.exe file onto the terminal so that it automatically finds its location. Press enter.
8. Use Subs2SRS. Yay.
Every time you wish to use subs2srs, you will have to repeat steps 6 and 7 to open the program.
Thanks a lot for the patient hand holding cb, and for your help too Asriel.
Edited: 2010-03-05, 7:22 pm