Oyster offers a subscription ebook service which enables readers to access a catalog of 500,000 titles for $10 per month. Initially only available for iDevices, the service is now open to Android users (and it will soon be available in your web browser) - but only ones in the US.
Unlike their competitor Scribd, Oyster is still geographically limited to the US. In the long run this could be its greatest weakness, but I would bet that Oysters knows this and plans to address it in the near future.
If you are currently an Oyster user, please do us a favor and tell us what you think of the app. I'm sure I'm not the only Android user which is eagerly waiting for details about how well the new Oyster app works.