I haven't had alot to say about software based arrangers given there was not much in terms of updates. I have recently made some updates as follows:
forte 2 (VST Host)
These updates are sufficient to update my arranger system to flr2009.
I am still waiting for Garritan to come out with their version of the GM Wavetable. It has been slow in coming given that they are changing everything over to their new sample player, namely, Aria. It uses soundfonts (old technology). We will see how well this will work/sound.
I have been using my software based arranger system now for many years and will continue to do so.