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if you redirect them into one site you consolidate your link popularity into one site making it a monster site. it will also help branding and simplify other aspects.
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. ;)
if you have massive redirects into one domain you may trigger a flag at google hq as doing something suspicious. some people buy expired domains and then redirect their link popularity into one site. google is still trying to get control of that situation.
search engines are pretty good at identifying networks and devaluing the links between sites in the same network. if you wanted to develop the .com, .org and .net variations into 3 sites and interlinking them i doubt you would have the best seo benefit.
personally i would not develop the .com, .net and .org into 3 sites. i think it would cause problems with branding and type-in traffic. i would prefer to register widgetscompany.com, widgetsforums.com and widgetsdownloads.com. if i wanted to hide the fact they were really one network i would use different whois, different hosting companies and be careful with the linking pattern.