Very interesting ideas!!!Here are some additional thoughts...
These "mini-blogs" or "add-on" blogs seem to be popping up everywhere. I have recently given a lot of thought towards using the blog that is attached to my eBay accounts.
I haven't tested this yet, but ebay is obviously spidered daily and links from these mini-blogs should therefore get a lot of action.
This definitely can create some amazing cross linking chains.
Phil G