Yeah, as Danfun pointed out, the Star Trek TOS Blu-Rays have both versions of each episode: the unremastered originals and the "improved" remastered editions.

Personally, I prefer the original effects--in the majority of cases. But it's really nice to have both available. Wish I could say the same for Star Wars.

Oh, and the Season 3 Blu-Ray has a special bonus: the original cut of the second pilot, "Where No Man Has Gone Before." This has several pieces of alternate narration from Kirk, and very retro "bumpers" to reintroduce the show on coming back from commercial breaks, at the beginning of each new "act."

This version was actually believed lost for years and years--because Gene Roddenberry donated his personal copy to the Smithsonian, which promptly let it languish in a vault. Some collector in Germany found another copy and let CBS-Paramount use it as a source for a new release.