[If it seems like there questions below that are answered above, it is because I previously didn't address those questions in this message and have made an edit.]

Are you tired of in-browser trading? Garish graphic designs got your inter-pipes clogged with cookies? Should you hit refresh or wait for that trade page to load? Is hand formating API calls because you lost your yubikey becoming tedious?

Then for you I present tulpenmanie, a multi-market exchange client: https://github.com/3M3RY/tulpenmanie

It displays tickers, makes limit and market orders, cancels orders, and can initiate bitcoin transfers between exchanges.

Right now I'm working on supporting streaming exchange APIs which looks like I'll be overhauling the exchange module system. I get that done and I can move on to things like charts and depth tables.

Supported exchanges:

• Bitstamp
• BTC-e
• CambBX
• MtGox

I'll be adding more, queued by volume.

Requires Python-2.7 and PyQt4.
Unless you're on Gentoo it's manual install only for now.
Gentoo install instructions

Code:

USE="git" emerge -u layman && layman -a bitcoin && emerge -av tulpenmanie

I've got it to run on windows, and I plan to make an installer. Please be patient, I don't have a windows install anywhere. Rest assured that I am making every effort to maintain cross-platform compatibility. First I need to stabilize what I have before I can deal with OS's that I never use.

Getting it to work on pre-intel OSx is almost impossible. As for later versions I don't know.

Consider it in beta for now.
If there are questions or problems I lurk in the #bitcoin channel when I can, nick EM3RY.
If it seems like there questions below that are answered above, it is because I previously didn't address those questions in this message and have made an edit.

What does MtGox's terms of service say about yubikeys?

Mt. Gox shall not replace any key lost by a Member.

So what happens if you lose one?

We also reserve the right to cancel unconfirmed Accounts or Accounts that have been inactive for a period of 6 months or more, or to modify or discontinue our Site or Platform. Members agree that Mt. Gox will not be liable to them or to any third party for termination of their Account or access to the Site.

The fact is MtGox has no clear policy on accounts with yubikeys. The terms of service do not seem to clarify the meaning of "inactive", "cancel account", or "termination of account". If you lose your yubikey, MtGox might be nice and violate their own terms of service, or they might repeat "We apologize for any inconvenience caused" until your six months are up.

If you do have an account with a yubikey take your money someplace with competitive service policies in place as fast a possible, lest you get robbed like me.