I’m also looking for motion sensors that work properly with openHAB 2. There seems to be quite some devices out there for this purpose. However, it’s at the moment very time consuming to find out which of them are well supported by openHAB. It’s really a pitty that openHAB does not have a wiki like FHEM yet where you can easily search for compatible hardware components. For instance take a look at http://www.fhemwiki.de/wiki/Kategorie:Bewegungs-_und_Anwesenheitsmelder. Sorry, it’s in German. Anyway I think it’s a very good example how it could be done. It’s a simple media wiki that describes hardware products and tags them by the manufacturer and sensor type. That allows you, for instance, to easily list all supported motion sensors.
I think this is a must have for openHAB. The only question is how it should be implemented (with mediawiki or something else?) and where it should be hosted. In order to keep this thread focussed I have created a new topic to discuss this: Wiki listing all compatible hardware