Hi
Personally i prefer the 1.0.2 version, both of them are fast and light, some say 0.9.2 is faster but even if it is faster i can´t really notice it.
with version 1.0.2 i can switch the pretty permalink function on very easily, i was unable to do that with version 0.9.2, in fact i was unable to turm it on and spent a good amount of time in the support forums trying what everyone said (multiviews, htacess etc etc etc), the permalink structure is a bonus point for me in any forum script (i dont like all those cripthgraphic urls).
visually (user side) there aren’t many differences, from the admin prespective version 0.9.2 has a “wordpress retro look” version 1.0.2 looks like wordpress 3.0 .
version 1.0.2 added a few functions/pluggins to the core that were missing or needed a pluggin in 0.9.2.
if you use wordpress, version 1.0.2 can be integrated a lot easier than 0.9.2.
There’s been some talk about forking it but in my opinion the next version (pluggin) will be what everyone wanted, better integration at several levels, no backpress dependency, bbpress admin area inside wordpress etc etc)
i tried several forum scripts and i think nobody will be angry if i write a few lines about them:
1- phpbb3 – fairly simple to setup but way too much options in the admin area, nothing difficult as it is understandable but no “pretty permalink structure”, there was a pluggin but you need to reinstall it with every new version and its a pain to even set it up.
2- SMF – simple to setup but its kind of complicated to get around all those options, to much stuff.
3- PunBB/FluxBB – Original forum script and fork – both were a breeze to install, PunBB had native permalink structure and FluxBB had a pluggin but in my opinion the community has lost his “power” forking PunBB split the community but i could be wrong.
4- Simple press – the best forum pluggin for wordpress, had most stuff i wanted (clean urls, integration with wordpress at all levels, theme, users etc) nice community forum, international language support but it was sluggish, there were a few tips on how to optimize its speed but never managed to optimize it, otherwise a great forum script for wordpress.
5- MyBB – easy to instal with a easy to understand administration area, great community, lots of pluggins, themes, international support, fast forum system, clean urls (through pluggin) etc, if the bbpress project doesnt take off in next version it willprobably be my choice.
Hope this helps you.