PostGirls and PostBoys, be prepared!
The upcoming release of PostGIS 1.5.0 (available as beta1 beta2) will require GEOS in version 3.1.0 or later.
The beta1 testing results suggested to bump the minimum GEOS version to 3.1.0. The GEOS requirement issue was one of the heavily discussed topics on the postgis-devel this month.
The PostGIS team is going to give GEOS a nice present for its 10th round month birthday.