PostGIS 2.1.1 maintenance release was released just yesterday. Details are on the PostGIS.net site: PostGIS 2.1.1 release notes.
For windows users, we have binaries available for PostgreSQL 9.0-9.3 (64-bit) and 9.2-9.3 (32-bit). Which are available in the winnie bot section of download page. We plan to have the windows installers available for 9.2 and 9.3 (both 32 and 64-bit) in the next week or so.