I didn't mean to imply that all multi-tasking apps were, or were going to be, a problem.

The issue seems that it will only come up when a badly written app is used. TomTom for example, will pop up a notification to tell you it's gong to shut down or go to sleep when you are no longer using it and put it into the background.

If the iOS is itself supposed to shut down apps, then that mechanism is either not working properly or something the app is doing is preventing iOS from shutting it down. Perhaps it's reporting back that it's still in full use, so it doesn't get shut down.

Squeezecast was $6 - not expensive in the grand scheme of things, but quite a premium price for this type of app in the iOS market. It's a pretty basic client and doesn't have much functionality on its own. That's another reason it's so irritating that it's so bloody buggy.

Another nice feature of SBSettings is its ability to list apps currently running in the background. The iOS multi-tasking bar unfortunately lists all recent apps, whether or not they're in the background. It gets crowded pretty quickly.