I did my first commute in the rain this a.m.
I figure, I've got a ti bike with fenders and disc brakes and rain gear and the only thing keeping me from riding in rain is my own wussiness. To deserve my bike, I figure I've really got to put it through it's paces.
So this morning, with mild temps (57) and nearly nonexistent traffic because of yesterday's holiday, was the perfect time to head out in a very light drizzle.
It was fine. Great, even. Saw one other woman on a bike and almost as many cars. 
This afternoon was a different story, however (lots of bikes!!).
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle