I've got a Gmail invite on hand myself. I'll give it to you if you're willing to pay it forward. (Wouldn't it be cool to find out that Jonas has initiated an uncontrollable chain reaction of random acts of kindness?)
Update: the invite went to Meredith Beattie, who puts in many long hours for the Women in Community Service. Thank you Meredith!
One thing I often find myself wanting to do is find who has linked to a
given post. Backlink trackers give you this
information, or at least they try to. I like using the Technorati bookmarklet while browsing, but as Lilia Efimova indicates, Technorati forgets the links that scroll off weblog front pages so it's useless for older posts.