Receptional_Andy - 9:37 pm on Jul 12, 2008 (gmt 0)

I think there's a lot of leeway in terms of diversity of links (geographically or otherwise, and 'incestuous' links aside). Sites quite naturally acquire volumes of links from seemingly unrelated communities, sometimes in a very spiky fashion.

Of course, an algorithm is not about one factor in isolation, but a series of criteria with a cumulative effect - so you could easily draw the wrong type of attention to yourself with unusual linking patterns, especially if they appeared 'artificial'.