There is a new journal of the European Mathematical Society that seems perfect for these articles: [EMS Surveys in Mathematical Sciences][1]. The description at the link reads:
> The *EMS Surveys in Mathematical Sciences* is dedicated to publishing authoritative surveys and high-level expositions in all areas of mathematical sciences. It is a peer-reviewed periodical which communicates advances of mathematical knowledge to give rise to greater progress and cross-fertilization of ideas. Surveys should be written in a style accessible to a broad audience, and might include ideas on conceivable applications or conceptual problems posed by the contents of the survey. 

I am actually quite excited about this, as there are some notes I've been sitting on trying to find an appropriate place for them. This may be the solution.


  [1]: http://www.ems-ph.org/journals/journal.php?jrn=emss