Other than being a song on Vonda Shepard's debut album (a good disk, you can buy it here), I've found myself in that position lately. Looking for something on someone else's blog. I'll read a reference to someone or something and I can tell by the context that this has been mentioned before, but perhaps I'm a Kenna-come-lately and I've only been around for the last month or two.
Wouldn't it be nice if Blogger offered a search feature so you could search current posts and the archives for other similar references? If that were the case, I wouldn't have to email you individually to ask the question. Just a thought.