From Erwin van Hunen:
Doppler for iPhone and iPod Touch is an RSS reader that allows you to easily synchronize your Google Reader subscriptions to your device. Using Doppler you can read your subscribed RSS feeds on the go without needing to have an online connection using Safari. Just enter your google account and your google password, select the feeds you want to have downloaded and select the refresh button. Read your posts and the next time you press the refresh button Doppler will mark the posts as read on Google Reader too, so you will not have to read the same post twice. Free until the 20th of July! If you have any issues with Doppler, do not hesitate to contact me. I -will- reply. Click 'Doppler Support' below for release notes of the current and upcoming versions.