This version came with a strange number (2.99.0) because itís the last series before IEs4Linux 3. That version will have many new features. IEs4Linux 2.99.0 has MANY improvements, bug fixes and some new features. including OS X support and a beautiful GUI.

Changelog:

On Mac
* Use Darwine or finkís wine (thanks to Mike Kronenberg)
* Download cabextract if itís missing
* Use logical folders (~/Applications)
* Use curl, no need for wget
* Few macfied things

if interested see the full post about IEs4Linux & IEs4Mac.