Rogers Cadenhead notes that BlogLines seems to be slipping beneath the waves:

Some people are getting the error "Port 80 says: Bad Gateway ... proxy server received invalid response from upstream server," which suggests that there's a load-balancing problem with the site. The Next Web reported in October that the owner of Bloglines, Ask.Com, tried unsuccessfully to sell the site and has outsourced the operation to China. An unofficial Twitter account, bloglines, has been tracking the site for a while and claims that it's now being run strictly "in maintenance mode."

This is the one large drawback to online services: if they vaporize for any reason, you can be completely dead in the water. Client side apps may not be perfect, but at least you have something to ponder :) Ultimately, I think the RIA (Rich Internet App) is the proper blend, because you have a client side cache of your stuff, even if the service dies. Kind of the best of both worlds...