Starting with the January 2006 issue, the publication policy of the Operating System Review is changing. In particular, each issue will be organized around a theme and submissions will be solicited for that theme. Guest editors will often be chosen to solicit and review submissions for a special topics issue. We are interested in having a broad range of special topics reflecting both academic and industrial interests. Please send suggestions for special topics issues to the OSR editor, Jeanna Matthews (jnm@clarkson.edu). The first special topics issue will be related to PlanetLab and Marc Fiuczynski (mef@cs.princeton.edu) will the guest editor. For this issue, we seek submissions on all aspects related to PlanetLab. Topics of interest, but not limited to, include: - Mature long-running services currently operating on PlanetLab - Management tools that ease the deployment of PlanetLab slices - Network measurement tools - Infrastructure services - Debugging and monitoring related to PlanetLab - Resource management, discovery, etc. Papers will be evaluated by a review committee. The primary criteria for acceptance will be clarity of explanation and relationship to PlanetLab. This special issue does not have a predefined format or a target number of accepted papers, but there is a soft cap of roughly 84 pages of text devoted to papers. Papers should be double column including figures and tables in standard ACM format and submitted in printable postscript or pdf. If you are interested in submitting to this issue of OSR, please send email to mef@cs.princeton.edu with a brief description of your submission by November 1st 2005. The final submission will be due November 15 2005.