Question: Which seasons are available for download in HD?
About the article "Gilmore Girls", section "DVD releases".

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"Warner Bros. Home Entertainment" has released all seven seasons of "Gilmore Girls" on DVD in region 1, 2, 4.
All seasons are available for digital download on the iTunes Store, Amazon.com and other digital sales websites.
Seasons 4 through 7 are also available in HD on iTunes Store.
Seasons one through six are available on DVD in Regions 1, 2 and 4, as well as for online streaming on Netflix and Hulu and online download in the US, Canadian, UK, and Australian iTunes Stores.
In addition, the seventh season is available on DVD in Region 1 and in the US, Canadian, and UK iTunes Stores.
The episode "" is available on DVD in Region 1 and for download in the US iTunes Store.
The eighth and final season is also available for download in the US iTunes Store.
Despite being available in HD over streaming and download video services, and seasons four through eight being filmed in HD, no Blu-ray release of "Psych" exists. 
Prior to April 30, 2012, there were eight free-to-air HDTV channels originating in Germany broadcast via satellite: Das Erste HD, ZDF HD, Arte HD, Anixe HD, EinsFestival HD, Sonnenklar.TV HD, QVC HD and HSE24 HD.
After 30 April 2012, when all analogue satellite broadcasts ceased, ten additional FTA HD channels became available (all of which are public service channels): Phoenix HD, NDR HD, WDR HD, BR HD, SWR HD, ZDFneo HD, ZDFinfo HD, ZDFkultur HD, 3sat HD and KiKa HD. 
In January 2006, Apple began offering the miniseries, season 1 and season 2 episodes for purchase on the U.S. version of its iTunes Store.
After a delay, season 3 episodes were also made available.
NBCUniversal, the producer and owner of the show, has provided a number of its shows for purchase the day after broadcast to U.S. customers.
In early December 2007, all of the iTunes "Battlestar Galactica" episodes were removed along with other NBC-Universal content, but were restored, and in mid-2009, the iTunes Store has all four seasons and the miniseries available.
Shortly after being removed from the iTunes service, Amazon's online Video on Demand store started making them available for sale.
All episodes as well as the miniseries and the TV movie "Razor" are available for purchase in Windows Media Format.
Since May 2008, the newest episodes are added to Syfy.com Rewind and NBC's Hulu sites eight days after the original air date.
As of May 6, "Battlestar Galactica" can be downloaded through the Zune marketplace.
All four seasons as well as the miniseries are currently available in both HD and SD format for purchase through the Xbox Live Marketplace for playback via Xbox 360 game consoles.
On September 9, 2008, all episodes so far including the miniseries were released on iTunes, being released in both Standard and HD format (except for the miniseries, which is only available in Standard format).
In February 2009, episodes of "Battlestar Galactica" became available in HD format at the UK iTunes Store.
Currently, "Battlestar"s four seasons can also be viewed on Netflix.
In March 2009, PlayStation Network began offering episodes for download on the PlayStation 3 and PSP devices. 
As of August 2011, the Zune Marketplace has 62 apps for Zune HD, of which 42 are games.
All of the apps and games are free.
Apps available excluding games are Calendar, Fingerpaint, Stopwatch, Alarm Clock, Chord Finder, Facebook, Twitter, MSN Money, MSN Weather, Calculator, Piano, Metronome, Level, Drum Machine, Fan Prediction, Shuffle by Album, Windows Live Messenger, Notes, Email and Zune Reader.
An extension to the Microsoft XNA framework providing development support for the Zune HD was released on September 16, 2009.
The Zune PC Software can be used for adding apps to the Zune HD.
The Windows Live Messenger app for the Zune HD was released on October 1, 2010, making Messenger available for all major mobile platforms.
The email app was released for the Zune HD in April 2011 allowing users to sync with their email accounts and download folders and emails.
The app is similar to the email interface on the Windows Phone.
No new apps have been released for Zune HD after August 2011.