Could you please add my name to the list of beta testers? I am now using v4.0.0. build 916 on Win7 x64 and I am experiencing some issues with it. Also, I am quite keen to try out some of the new functionality, which I am told will be available in v5.
I'd love to be a beta tester too. I'm currently using v4 on a Windows Vista laptop which I hotsync to an XP desktop where I have the software installed for when someone else is hogging my laptop :-) I also have a Win7 laptop in the house I can use too.