I write and post most of my posts using the BlogPress app, and it has served me well.
But today it didn't. When I tried to post my last entry, it hung. It eventually claimed to have posted it, but the entry didn't appear on the blog. I tried again, and the same thing happened. Then BlogPress crashed. When I restarted it, my entry was gone! Because BlogPress thought it had been posted, it was deleted from the list of drafts. But since it hadn't actually made it, it wasn't in the list of current posts either!
Enter iFile, a Cydia app available to jailbreakers that gives you actual access to your iPad's filesystem. I managed to find, in BlogPress's documents folder, all the drafts I'd saved today as text files and copy the text out to PlainText for safekeeping until I had time to try and repost. Success! A half hour's worth of typing saved!
For those naysayers who claim that the only reason to jailbreak is for silly cosmetic improvements - this is why I jailbreak!