If you’re familiar with bookmarking services like del.icio.us, you would probably find that Readbag isn’t a fantastic one. Readbag is a tool that let you store the links which you want to read later on. It will automatically archive the links after you visited in Readbag.
Readbag uses Google App engine so you only have to login with your Google account. Readbag has options to share your links as feed or share your links to other social bookmarking sites. API and offline mode are available in Readbag too!