Previously, I introduced a "read it later" link saving and sharing service called Readbag. Today, I've discovered another service that is almost identical in functionality: LaterLoop.
How similar are the two? First, both are based on Google App Engine, so if you have a Google account, there's no need to register separately. Secondly, both allow you to save links via Firefox extensions or bookmarklets. Both also offer mobile versions, including iPhone-specific versions, and both provide RSS feeds.
However, LaterLoop has its own unique features as well. For example, while it allows you to archive links (like Readbag), it also lets you add star ratings, which feels somewhat like Google's style. It doesn’t allow manual addition of links but does support importing links from services such as Delicious, RSS, and others. Its Firefox extension can even work in tandem with ScrapBook, another Firefox extension designed for saving and managing web pages, enabling offline webpage reading.
On the downside, LaterLoop’s reminder function isn't as comprehensive as Readbag's; it only allows you to send links that you starred on your mobile device to your email, which is somewhat disappointing. However, LaterLoop does cater to IE users by offering an IE extension, which Readbag does not.