iPhone Memory usage bloat, what gives?

[zephonic]

I have an iPhone 3GS with 8GB and iOS 5.1.1
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Practical available memory is usually 6+GB
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Yesterday, when I last backed up, my memory was about half full, a combination of music (0.9GB), photos (0.16GB) and apps (1.4GB).
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Just now, not even 24 hrs later, I see my memory usage has jumped up to nearly 5GB, leaving only 1.57GB free. When I look in iTunes, the yellow "other" bar now accounts for 2.2GB but I know I did not add anything there.
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The only new thing is that system settings notifies me it wants to install iOS6. I do not want to upgrade. Could it be that the phone downloaded the upgrade, even though I did not tell it to?
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If it is not the new OS waiting to be installed, what could it possibly be? And how do I get rid of all that bloat?
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Please advise, thanks in advance!

 

[Intell]

It will download iOS 6 OTA updates for when you want to update it, but it will only do so when connected to WiFi. There's no easy way to get rid of it.

 

[zephonic]

There's no easy way to get rid of it.

Shucks. Is there a not-so-easy way to get rid of it?

Thanks for your reply.

 

[Intell]

Shucks. Is there a not-so-easy way to get rid of it?

Thanks for your reply.

Jailbreak it, delete the file, wait for it to be redownloaded, repeat.