Yes that AccountMaven does look useful, but obviously has limitations in being USA based at the moment.
I've also come across
www.WeCanDo.Biz which features this push-me-pull-you aspect of networking, with a clearer focus on corporate rather than personal needs and offerings, and the benefit of a UK base.
Or, if you prefer chat amongst sales individuals, this seems like a fine place to do that and, if reading news and features about selling and sales management issues with some input in our Forum section from the "experts" is your thing, I'd humbly suggest that you might do worse than to check out our site.