MobileRSS, a RSS reader for the iPhone that syncs with Google Reader has added support for Read It Later.
While scanning through your feeds, you can now save pages you find directly to RIL.
Read It Later support is available in both the free and paid versions of MobileRSS.
MobileRSS makes use of Read It Later’s Open API that lets any developer make Read It Later applications. For a list of other applications and RSS reader with Read It Later support, check out the Apps Using Read It Later.