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Thanks so much!
You need to be careful with cross-linking between the websites.
I am not sure as to your goals for the portal webpage or website, but if intend it to rank well, I would think about developing more content for the site and building it out.
None of this is considered spamming, and all sites are doing well with one exception: I'm having trouble getting all sites listed in the Open Directory.
I was able to get listings in ODP (in different categories) for 3 of the 7 websites (one was the "portal" site), but after visiting the Open Directory Forums to check the status of my other sites, I was told that they considered the grouping of sites "deep linking" to the portal site. I argued the difference in an attempt to get the listings to no avail.
They simply told me that since the portal site has a listing, and those remaining sites are listed from there, that including my remaining sites would have been considered deep links.
(of course I dropped my argument there, fearing removal of the two other sites that "slipped by")
Anyway, I would suggest submitting your two "service sites" to ODP first, then going back and submitting your "portal" site afterwards, to avoid the same problem I've had.