I’ve written several articles on weblogs for various publications over the past few years. Each and every one of them has changed ‘weblog’ into ‘Web log’ per some style guide rule during the editing process, over my objections. This always gets my goat for some reason. It’s weblog, people!
On a related note, I came across this page on how you can cite a weblog entry in MLA style.
C. David Gammel, CAE 
Glad you found my page useful. I agree that the MLA handbook doesn’t really meet the needs of new media researchers.
I got a laugh one morning when blogger.com flagged “blog” as a misspelled word? If they don’t know how to spell it, who does?