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Over the next few days we'll be removing all TF2 items that were earned using external idling applications. We're going to adopt a zero tolerance policy for external applications used to manipulate the persistent item system. Due to us not having a policy in place prior to today, this time we're only removing the items earned through cheating the system. Going forward, if we find users using external applications, we'll remove all of their items. If you're interested, only about 4.5% of the players in TF2's community will be affected by this cleansing process.
Meanwhile, everyone who took the moral high road will soon be finding a new hat in their inventory. We've also significantly increased the chance of finding any of the existing hats.
We realize there is a high level of demand for items, and we're still working on systems to allow you to find them in new ways (via Trading, and crafting duplicates into desired items). However, we need to draw the line at running external applications.