Building a MythTV Linux Media PC. I looked at Knoppmyth and Mythdora , but I really liked Mythbuntu the best. So I am going to build a Home Media/Theater Computer! Here is what I plan to use as hardware...

Other Open Source Media Center software...

Windows  -  MediaPortal

Windows -  SesamTV

Mac OS X - CenterStage 

Linux - LinuxMCE   (this manages everything in your home from heating and cooling, to watering the yard, to watching movies! Requires Kubuntu 7.10 OS )

Mac, Linux, and Windows - Freevo

Mac, Linux, Windows, XBox -XBMC

Official MythTV web-site 

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Building a MythTV (Mythbuntu 7.10) Media PC : Parts March 31, 2008
All parts other than the iBlast antenna are recommended.
For an internal alternative to the HDHomeRun see:
the HD5500 - http://www.pchdtv.com/hd_5500.html

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Software:
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Mythbuntu: http://www.mythbuntu.org/

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Base System:
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DVI-i/SPDIF to HDMI Connection - http://www.hdtvsupply.com/dviautohdadt.html
My TV has HDMI and I chose to use a converter to combine my input. Check your TV and budget as there can be many options here.

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Core PC:
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Case     - http://www.newegg.com/Product/Product.aspx?Item=N82E16856101038
RAM      - http://www.newegg.com/Product/Product.aspx?Item=N82E16820145590
CPU       - http://www.newegg.com/Product/Product.aspx?Item=N82E16819103773
SOUND  - http://www.newegg.com/Product/Product.aspx?Item=N82E16829118109
Drive     - http://www.newegg.com/Product/Product.aspx?Item=N82E16822136012
Video    - http://www.newegg.com/Product/Product.aspx?Item=N82E16814121064
Tuner    - http://www.silicondust.com/wiki/products/hdhomerun
Remote - http://www.streamzap.com/

Any DVD/CD. Blu-Ray is best passed through an external player for now.

Note: you will need power supply, fans, etc...

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External Storage (Networked):
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http://www.lacie.com/us/products/product.htm?pid=10843

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Misc. Hardware:
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iBlast HDTV  - http://mythic.tv/product_info.php?products_id=63

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GeForce 7600GS 256MB AGP setup/Driver:
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http://www.nvidia.com/object/linux_display_ia32_1.0-9755.html
http://wilsonet.com/mythtv/fcmyth.php#hw

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HDHomeRun Information:
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http://www.mythtv.org/wiki/index.php/Silicondust_HDHomeRun

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Reference:
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http://antennaweb.org/
http://www.nab.org/AM/ASPCode/DTVStations/DTVStations.asp
http://www.mythtv.org/wiki/index.php/Configuring_HDTV

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Some on-line content and utilities:
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Hulu    - http://www.hulu.com/    
TitanTV - http://video.titantv.com/     (HDHomeRun + EyeTV 3 + TitanTV ON OS X 10.5 = ROCKS!!!!)
TVGuide - http://www.schedulesdirect.org/ 

Miro - http://www.getmiro.com/
ShowLinks - http://show-links.tv/

Not so much love for Linux, but fingers crossed... 

Veoh TV - http://www.veoh.com/veohTV/getStarted.html
Joost - http://www.joost.com/

GreenCine - http://www.greencine.com/main
Netflix - http://www.netflix.com/
Movielink - http://www.movielink.com/
ClickStar - http://cstar.com 

Movies-on-demand - http://www.movies-on-demand.tv/

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I also considered a Mac Mini. CenterStage looks really kick ass and I liked EyeTV 3/EyeTV 250 also. If you go with a Mac Mini these may come in handy also. 

Flip4Mac - http://www.microsoft.com/mac/products/flip4mac.mspx

MplayerX - http://mplayerosx.sourceforge.net/

DivX player - http://www.divx.com/divx/mac/

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For the Windows fans MediaPortal is an Open source alternative for Windows MCE Media Center... 

and finally, if you're lazy, too busy, or don't care to setup a media computer try one of these...

AppleTV

Vudu