Hoople - 6:54 pm on Dec 24, 2011 (gmt 0)
Some have noted a traffic drop when some/many of their back links come from padalized sites. Lots of new links from bad neighborhoods produce a similar feel to the traffic loss too.
Perhaps it's time to build some quality back links that are from sites on your topic and in your niche's neighborhood? Don't forget local (Chamber of Commerce, BBB, town/regional directories.)
The OOP I recently fixed was poor anchor text variety (2 combinations) of too quickly acquired links. Took about 90 days to return to normal.