I typically use "Comics.com" and select the strips I follow there-you can set up "your own" comics page there. Unfortunately, "Comics.com" is only United Features Syndicate comics, so I have to do something else for a number of other strips I like to follow. I do this all on the Web, so I just have bookmarks for all the comics I like to read. An app that aggregates all of my favorite comics sure would be helpful...