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All of these 8 sites have different domains and link pages with PR 4-5. The thing is that they all have the same IP address. In addition to 8 they are offering more links from other domains, but again with the same IP address.
What should I do?
You raise an interesing point. I seem to remember reading that these links may be worth a lot less being all from the same source. Also, it could be regarded as too much of a link community which could be damaging.
The important issue for spam penalties is who you link to. 7 links to the same ip is worrying, with them all linking back. You could block the spider on your links out ;) or just don't risk it...... I would drop them.