after setting up gmail sync through exchange on my iphone 4 i could never get it to actually push right.. its like it would push one email i would read it then after that i would have to get emails manually by opening mail.app. it just seemed like it never actually pushed email besides a couple random emails. so on my old jailbroken but no longer activated 3g i added the account back on that phone and it worked perfectly weather i manually killed the mail.app with sbsettings or just closed it with home button. so that got me thinking and i uninstalled backgrounder on my iphone 4 which i used with multiflow and woila. push works perfectly fine. i tried a couple different settings with backgrounder but never could get it to work right with pushing gmail. something with the way it permanently kills it or something.. anyone else have this problem? not a huge problem but i did like backgrounder + multiflow.