MythTV has a lot of different components and dependancies. It can can hours, if not days to get the right version of each thing MythTV depends on all installed and working together.
It doesn't have to be that way. Some people in the MythTV community have done a great job creating easy to install MythTV Linux distributions that are purpose built for running MythTV.
Generally the downside to using a MythTV distribution is that they format your hard drive and start from scratch. If you want to install MythTV on an existing system without losing your other Linux functionality and files, then a MythTV distribution isn't the route for you. However, if you have a PC you want to fully dedicate to MythTV, then these are a great option.
There are two popular MythTV Linux distributions, and many less popular ones. I suggest you stick with these two unless you have a good reason and prior MythTV experience.
The two most popular MythTV distributions, which I suggest you start with if you are new to MythTV are:
Primary MythTV Distributions
KnoppMyth
KnoppMyth
A Debian MythTV distribution, similar to, but not really based on Knoppix. View our KnoppMyth Screencast that shows how KnoppMyth can be installed in about 20 minutes. (Official KnoppMyth Site)
MythDora
A MythTV distribution built on Fedora. View the MythDora HOWTO and Screencast. (The Official MythDora Site)
Mythbuntu
In their words, it provides "an Ubuntu based MythTV distribution that is easy to configure, maintain, and use." Mythbuntu is the newest of the now three major distributions. Visit the official site.
Conclusion
If you like bleeding edge and constant releases, Mythbuntu's for you. If you're a linux geek and want this as a hobby, KnoppMyth may be your speed, and I don't mean that in a bad way. MythDora would be what would I suggest for a "just make it work" distribution.
If you have the time, I suggest you try each to see which one works better for you. I don't think one's really better than the other. Each one goes after a slightly different type of user.
If you have hardware problem with one, another may work for you.
Also, at 20 minutes to install KnoppMyth, and MythDora less than an hour, it's not that big of a deal to try them all if this is a system that you plan to use for a while.
Happy Installing!

just wanted to toss it out
New LinuxMCE release adds a 3d gyro ui for Myth
Mythbuntu now included
Text says: "The two most
One thing that I like very
I made a notice. I can also
Do you think the type of usb
RE
Yeah I didn't think it was
KnoppMyth
dates on pages
Kamil
An Ubuntu based MythTV
Greate device But which's
This is a great
Good infos Corning Credit
Cool Device
MythTV has a lot of diverse
MythTV is amazing
Cool device
Nice
Good Article
MythTV
MythTV dependencies
MythTV
MythTV Linux distributions
Need to mention that
Need to mention that Knoppmyth was the first Linux distribution geared at bring MythTV to the public.
Pioneer AVIC-U310BT
So when is mythbuntu slated
So when is mythbuntu slated to release?
Jess @Dog Collars
Thanks for making such a
Thanks for making such a cool project. I've been checking the site for the Windows version, but I never left a comment about it. I know you are working hard and doing it for free so you shouldn't feel rushed or anything. Team Development
Awesome post
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TV Distributions!
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The site was informative and