http://jmsoler.free.fr/didacticiel/blender/tutor/cpl_import_ai_en.htm
Current version : Version 0.1.7c
Now in the current blender cvs !

the current version is 017d .
Excellent work. I needed to import a .ai file a while ago and I tried the built-in ai importer but it messed up a lot of the shapes so I had to remodel pretty much the entire thing in Blender.
It also didn’t support higher up versions of the ai format so I ended up using version 3. I just tried this script and all the geometry imported perfectly.
It’s great to finally have a dependable vector importer. I hope this script replaces the current one in the next Blender release.
new version :
http://jmsoler.free.fr/util/blenderfile/py/ai2obj_018.py
Does this new version do a better job of importing the handles? IMO that was the worst part about the old one is that the handles were never correct and made everypoint make a sharp edge instead of rounded curves.