It's no secret the iOS multi-tasking and notification functions need to be updated by Apple. However, thanks to Cydia, jailbreak users don't have to sit on their laurels and wait for the snail-paced Apple to update these functions on their iPhones.
Physwitch ($2 in the BigBoss repository), tackles the issue of multitasking by allowing users to switch between running apps by hitting the up and down volume keys. You can then activate the selected app by hitting both volume keys at once. Hopefully something like this eventually finds its way into future iterations of iOS.
Notifications are a completely different beast. Constantly having to launch each app to clear the notifications can be a real pain. Sadly, there is no fix for this. However, until Apple or someone else comes up with a soltution, the least we can do is be allowed to customize the look of these insipid boxes. AlertArtist ($.99 in the BigBoss repository), allows users to customize the color, font, border, and shadow of the notification alert boxes. Not quite an elegant notification solution like this fan made concept, but it will entertain me in the meantime.