Here's all the latest and greatest. Based on my experience using this on production equipment the upgrades have resolved a number of significant bugs.
FortiAnalyzer
4.0 MR1 Patch 2, Build 128
FortiClient
4.0 MR1 Patch 2, Build 138
FortiManager
4.0 MR1 Patch 2, Build 221
FortiOS
4.0 GA Patch 4, Build 113
Also, if anyone uses FortiClient, FortiDB or FortiWeb on a regular basis do post a comment if you are interested in contributing articles about these products.