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Hey Anthony -- thanks for your answer.  What you've described as a solution is basically what I've already done (short of using the COA form).  Our traffic has dropped off pretty significant hopefully it won't be too long before the redirects start to kick in.

We are in the process of tackling this type of issue as well.  While we have not yet implemented it (so I can't endorse it), so far the standout appears to be assistly (www.assistly.com).  They also have a help center which is a sort of Q&A that you can build up and users can help themselves through.

OK this one's a little confusing, please try to follow along.

We recently went through a rebranding where we brought a new domain online for one of our brands (we'll call this domain 'B' -- it's also not the site linked to in my profile, not to confuse things).  This brand accounted for 90% of the pages and 90% of the e-comm on the existing domain (we'll call the existing domain 'A') .  'A' was also redesigned and it's URL structure has changed.  We have 301s in place on A that redirect to B for those 90% of pages and we also have internal 301s on A for the remaining 10% of pages whose URL has changed as a result of the A redesign

What I'm wondering is if I should tell Google through webmaster tools that 'A' is now 'B' through the 'Change of Address' form. If I do this, will the existing products that remain on A suffer?  I suppose I could just 301 the 10% of URLs on B back to A but I'm wondering if Google would see that as a loop since I just got done telling it that A is now B.

I realize there probably isn't a perfect answer here but I'm looking for the "least worst" solution.  I also realize that it's not optimal that we moved 90% of the pages from A to B, but it's the situation we're in.