I agree with beerguy and others who recommend hardware based calibration. The problem is that the devices available in the consumer price range (less than $1000) do not do a very good job. In MOST cases, you will end up better of than if you used a website or other pattern generator and your eyes.
Most of the consumer based hardware devices are tri-color sensors that rely on integrated filters and internal callibration profiles. They ARE NOT designed to work with LCD displays (even if the sales pitch says so). They are extrenely prone to drift due to filter degredation and temperature/humidity. Placement on the screen, pixel size, pixel alignment, cosine error and a dozen other things directly affect the readings. They use diffusor or "slits" to average the light coming from each pixel group (Red Green Blue) and don't do it well. Toss in the poorly designed/featured software and you are fighting an uphill battle. Display callibration is an art that is not easily mastered. Print and video production houses struggle daily with these problems, even when using hardware that costs tens of thousands of dollars.
That is not to say that beerguy (or any of you) are not having great results with the spyder (or similarly priced colorimeter) it just means that most people will not fall into that lucky category.
On the same note, there is not much you can do unless you want to spend more money and go down a rabbit hole with regard to learning about color callibration.
For those who are serious about color and have a need to be very accurate, I would check out the products developed by Cliff Plavin at Progressive Labs
http://www.progressivelabs.net/
Don't be fooled by the look of the C-5, its internal sensors are nothing like the similar looking products being sold (they are all "puck" colorimters, but greatly differ in sensor quality, filters, chipset, and firmware). The C-5 is the only tri-color sensor out there that can do direct view LCD well.
Also check out the freeware package HFCR software.
http://www.homecinema-fr.com/colorimetre/index_en.php There are huge threads at avsforum.com and a few other places.
While these devices are aimed at Home Theater and video display callibration, they can be leveraged four our purposes.