Rated 5 out of 5 stars
Great approach, well done! What is really appealing is the lightning-fast speed. My folders contain 100-10000 mails and it shows summaries instantly. Graphic design, implementation: kudos. I have been making tb plugins myself, and this one is really good.
Background: I am looking for a plugin that does "zero email" analytics. There is a need for companies to reduce internal emails, because people can collaborate much better using online collaboration tools. I wanted to check how my own tool, getRefinder.com, helps reduce our own internal emails. As such, Mail-Summaries could show me a cluster of sent/received by email DOMAIN - implying company/org groups. That would show how much I communicate internally compared to externally. "Zero Email" is a big issue today, and I would like to recommend Email Summaries further to other consultants and providers and users in the area. If you want to promote it further, use the twitter hashtags "zeroemail" or "socbiz". A mesage like "use mail-summaries to analyse how close you are to #zeroemail" would help. Get in touch with @leobard to give feedback.
Note that zeroemail means: company internal emails. External emails are fine (for now :-)
Business/enterprise isn't a priority for me, but at some point, I plan on making it possible to extend/modify the various summaries. Once that happens, it shouldn't be hard to support something like this.