thx guys. I will read more on arcfn.com. I am very happy that there actually is more documentation!
And I am still interested to see more information here. Are there other people out there, who have invested some energy in enhancing the usability of arc? Please tell me more!
Take a look at anarki, a community-maintained fork of arc with a bunch of enhancements (I don't know if there's a simple list of changes anywhere) ... and rainbow (an arc interpreter in java; mostly the same as arc except for access to java libs; dunno if that counts as "enhancing usability" :))
