Yup. I've just done it...
Just because I can. 
Before JBing, I also used Umbrella to store my SHSH blobs locally:
http://thefirmwareumbrella.blogspot.com/
Jailbreakme.com... easiest Jailbreak I've ever used. Much quicker & simpler than Redsn0w & Blackra1n.
Although... given that it does it via the browser, it must be a rather dodgy hole which Apple will surely be fixing soon...
Cydia is so slow at the moment. Can't get anything to load. May just have to try & sort the rest out tomorrow.