EDIT: Common.Logging 2.1.1 was released on June 9, 2012 and the Github page is fairly active, with the author commenting specifically on the health of the project.
We're looking at using Common.Logging in a new .NET project but I'm a bit concerned that the project seems to have become inactive. The homepage was last updated in 2009 and the latest version available on SourceForge was created in 2010. I've already found an incompatibility with NLog 2 and I'm concerned that this may become a bigger problem over time. I have noticed that Enterprise Library 5.0 isn't listed as being compatible but I've not tried it.
Are there any other alternatives that provide a similar common interface?