I own exactly 6 computer. A laptop (LCD), two desktops with LCD and 3 desktops CRT.
They are 6 different brands.
I manually, should I see by eye with shades of grays and other primitive tests, calibrated the two LCDs, but the laptop don't have any adjustment other than bright and contrast. The CRTs are mostly on the factory default.
My websites looks and all the websites looks slightly different on each monitor. Nothing more, nothing less, just "slightly" difference.
If you're seeing such a big different between the calibrated and non-calibrated monitors, either the non-calibrated is totally whacked, or you over-calibrated the others(don't know if that possible).