In older systems where TPMs were considered "add on modules," like my ASUS mobo, they can be removed.
In newer systems, most manufacturers are soldering the chips to the mainboard. If this is the case, then no, you're not likely able to remove it.
My recommendation to anyone buying a new machine, either ask the mfg. to install Linux by default, meaning the TPM will be under your control only, or see if they'll give you a "downgrade" to Windows 7.
The key I'm trying to impress upon all of the tech savvy and not-so-tech-savvy FReepers is not to fear the TPM, but understand it. It's actually VERY cool tech if you can control it yourself. It virtually assures that your data is safe if your machine is every stolen or confiscated. It's a digital combination lock that can't be opened with bolt cutters.
And if you're finding yourself behind bars because you're refusing to give your password to authorities so that they can snoop your system, you've got much bigger problems than your 4th and 5th amendment rights being violated. Matter of fact, there was a case recently where an alleged child pornographer was allowed to walk because he refused to reveal the password to his encrypted disks:
I don’t know of very many desktop makers that have tpm’s. Or laptops really unless you search for them.
The one thing about Win8 that I do like is that it’s more like Truecrypt. Win7 demanded a tpm and/or a usb drive to work. Win8 you can do password only in gpedit.