"Not Found" apps hanging up my autoupdate... what can I do?
You will not be able to update them, they have been pulled from the market by either the developer or by google. PDA Net for example was recently pulled by google. You could see if the developers offer an alternative means to download, either from their website or a 3rd party market, like amazon app store. Then remove then from your device so they no longer appear in your google market. Then reinstall them via the 3rd party market, or by "sideloading" them.