Despite being incredibly busy due to some nightmare project I have been working on for the last couple of months, I have managed to sneak in some time to update Sid Player Pro to catch up with iOS4's idea of multitasking.
Sid Player Pro now can stream audio in the background, just as the iPod application can. Moreover, it also reacts to headphone remote control events and hooks itself with the lock and multimedia dock screen controls.
The update has been submitted to Apple for review and we expect it to be posted very soon. Once Sid Player Pro appears in the AppStore, Module Player and Pokey Player will also be updated.
Here's a video that demonstrates the new features in Sid Player Pro for iOS4.