I hate the trend of having to download individual apps to access different sites, most of which are powered by the same 2 or 3 forum engines. Why should I need to download a BIMMERPOST app, and then a separate App for Bimmerforums, Bimmerfest, etc. when they're all powered by vBulletin. Not to mention all the other forums I visit.
How about just making a mobile style available when you see a visitor coming in via browser on a mobile device, like most other major web sites (CNN, NYTimes, ESPN, etc.) Downloading separate apps for each site is stupid, IMO.