This site lets you read eBooks online or dowload a mobile Java, BlackBerry, iOS or Android reader app. The reader is attractive and works pretty well. It comes with a few titles preinstalled and you can search and browse the catalog easily to find more.
The Wattpad Android, BlackBerry and iOS readers download full books and support reading offline. Wattpad's Java ME reader works differently. It uses your wireless connection to download a few pages at a time in the background while you are reading, which is fine as long as you have a connection. I do most of my reading on the subway where there is no wireless service. Wattpad offers standalone .jar versions of each of their books which don't require a wireless connection.The standalone books are available as a single .jar file or split into multiple 64 or 128KB files for older or very low end phones.