i'd agree. the number of outbound links probably set off some filter. theoildrum.com might appear to be a link farm to the filter.

a manual review of the site should prove that the site is not a spamblog ... but a source of real content.

check this article out. it was written by matt cutts, google engineer. topic: file a reinclusion request
The bulk of the outbound links come from the blogroll. Yet lots of sites have blogrolls, and they don't have trouble. Still I seems that that's the most plausible explanation.

That reinclusion request link was very enlightening. Thanks!

According to some the comments given on that page, it seems as if our reinclusion process is underway. But it's good to know there's an automated way to initiate it.

I've noticed lots of blogs putting their longer blogrolls onto separate pages and keeping only a very short list on the front page.  Perhaps that would help?