Subversion 1.0.9 has been released. This version fixes a performance issue inadvertantly introduced in 1.0.8. The team is recommending that you upgrade to 1.0.9.
The 1.1.0 release apparently suffers from the same performance issue and a 1.1.1 release is in the works.
Subversion can be found at http://subversion.tigris.org
The official announcement for this release can be found here.