I have a slightly different idea on this.
I current have example.com and example.net. I think I will also add example.org, as it is available.
I plan on writing some software for helping people with examples. I'd also like to start an online forum, as well as an online subscription service for those who would rather rent than own the software.
Is this too confusing?
example.com "Tools for managing examples"
example.net "Online services for managing examples"
example.org "Discussion and information about managing examples"
Of course, each site would have prominent front-page links to the other sites.
BTW, the "domains" and/or SEO forums are probaby better places to discuss this. I'd been meaning to post a question soliciting opinion on my idea on the domains forum, but, heck, I'll just piggy-back on this one. ;)