I have blogged a bunch on Gist over the last year. The Seattle startup has some nice traction going for it. It seemed pretty clear to me from the beginning that Gist would be a great CRM and/or Sales Enablement tool for the small to mid-size market. Check this nice blog on that at this link: Gist as a small business CRM tool.
More of my take on Gist can be found at: 12Sided, The Blog: Gist Posts