What do you think about using HTML as a basis for the log viewer? IMO it would not be so good because the fat client does have real advantages: better controls, faster response time, client side intelligence. I read more and more that the fat clients are coming back. Some companies are like an oil tanker. The whole industry just turned towards the thin client and has trouble seeing the (fat) light.
Often, when I use our clunky HTML based email client, I wish my local Outlook would work. But with no VPN connection available I have to wait through those endless timespans until the HTTP server decides to show me those pages of spam I long for.