There are several ways to ask something about adegenet, depending on what you are looking for:

Most questions will go there: questions/resquests about the package, bug reports, etc.:
- the adegenet forum (adegenet-forum AT lists DOT r-forge DOT r-project DOT org)
- to subscribe to this ML, go there
- browsable archives of adegenet forum.
- the R-sig-genetics mailing list, for general questions about the analysis of genetic markers in R

Want to track the evolution of the package from the inside ?
Subscribe to the commit mailing-list here

Contributions, direct contact with the author:
author's email (t.jombart AT imperial DOT ac DOT uk)

Please, do use the adegenet forum to ask questions concerning the package. Browsable archives of this mailing list allow other users to benefit from previous answers.