For jailbroken iPhones: For some reason or another, the mobile Safari browser on iPhones and iPod touch models updated to the latest firmware seems to constantly drop cookies, making iPhone-friendly sites like Google Reader and Remember the Milk a lot less useful. iRemember, a free one-fix app, makes a simple change in the Unix-y guts of your phone to help Safari hold onto its cookies better. Installing the app requires adding a repository to your Installer sources, but the fix seems to work, at least on Google sites. iRemember is a free download for jailbroken iPhones and iPod touches.