Just drop me a line here, what you think is important for the next CU. Please point to the original source, too.

To Be Added

04-07-2011: Ordnance Survey open maps are officially compatible with ODbL [1][2]
05-07-2011: new release 0.2.6 of NaviPOWM
09-07-2011: South Sudan is on the map [3]
10-07-2011: A video tutorial for Relation Toolbox JOSM plugin is online, with English subtitles.
11-07-2011: Komяpa and Hind made a userscript to show more info for GPX tracks.
13-07-2011: new data source for aerial photos that can be used to create OSM data is released by Austrian authorities [4]
15-07-2011: Richard Fairhurst released a very alpha version of Halcyon/PDF renderer [5] , related to Halcyon
Pascal Neis released OSMFight to compare userstats in mini-battles --!i! 22:08, 20 July 2011 (BST)
Ken Snyder (Placesmatters) introduces OSM HOT and their role for civic engagement to the Ford Foundation
a new routing library has been published: OsmSharp
19-09-2011 new release of OSM2World 0.1.7 ... can read pbf files now
04-10-2011 new release of OsmAnd 0.6.8 ... now with enhanced address search from offline data
09-10-2011 there is progress in the development of Libosmscout, see [6]

Community Updates/draft