There are currently many bugs implemented. Of course, you don't know which once are implemented and which ones are accidental, so go ahead and report them all. The reason for implemeted bugs is that to have done the code right the first time (or at all) was pointless, since a lot of it's just going to get thrown out again soon anyway. The most important bugs I want to know about are those that cause data loss or corruption. I don't know of any that exist, and will promptly fix any reported ones that are reproducible or obvious (i.e., the ones that I can figure out). Send bug reports to `calendar@mit.edu'. Thanks!