Maybe take a look at this new open-source HTML5 SSH client?
No plugins, and appears to work pretty well!
http://vimeo.com/24857127

Source code is here:
https://github.com/liftoff/GateOne

Also, from the author:

It's not actually an SSH client, it requires a bunch of Python code running server-side that it interfaces with. But that may still work for lish.

Yeah, I actually saw about the python component after posting. That's not too surprising, and probably isn't a huge issue either, as there must already be a backend for Lish.

The theory here being that a modified version of this (OSS & all) could be made to work for Linode.
It wouldn't need the login/bookmarks features obviously, but it's clearly a rather superior way of interacting with a shell. Clearer, probably more responsive, (I suspect) no paste issues...

I would love to see this as well. Here's another, that is all ajax based

http://code.google.com/p/shellinabox/

No, this one also is using an (C-based) backend server. All of the ajax clients are like that - there's no common way for JS to open a TCP socket, and even if there would, it'd be heavy and slow for most browsers to do SSH and such in JS.

Said that, I've used shellinabox for a MUD frontend, and it's easy to customize, relatively decent emulation. Better than Anyterm, at least.

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rsk, providing useless advice on the Internet since 2005.

If you need a web-based ssh client, use sshterm.com. It's free and quite handy.