Movies/TV Shows/DVD:
1. Batman (1966 TV series) - This is the big one. My favorite TV show ever. Rumored for some sort of a home video release ever since Batman (1989), but still nothing as of yet. Currently tied-up in huge legal issues between FOX (owner of the show), WB (owner of the characters), and the estate of William Dozier, the show's producer. Due to this, it is extremely unlikely it will ever see a release on any home format. Same goes for its companion show, The Green Hornet.
2. Sailor Moon - Considering its extreme popularity when it was out, and the relative obscurity of so much other anime that IS available, it's amazing (and practically criminal) that Sailor Moon currently isn't licensed in the US in any format, be it DVD, TV, books, toys, what have you. Toei is currently investigating relaunching Sailor Moon worldwide, so there may be new news on this front soon. For now, though, it is still unavailable.
Books/Comic books:
1. Ripley's Believe or Not! - Yes, there are several books published each year by Ripley's. Yes, many of them bear the name Ripley's Believe or Not! or some variation thereof. No, none of them really stick to the old formula or have the same magic. New Ripley's books use photography instead of drawings, and the content is more "extreme" and less historical. An anthology reissue series of the original newspaper comics and the prose pieces written for the books, kind of like what they are doing for Peanuts and Dick Tracy, would be a great idea. An equally great idea would be to reissue the Gold Key Ripley's comic books (True Ghost Stories, True War Stories, etc.).
2. The Works of Edsger Dijkstra - I'm somewhat of a CS nerd, and I enjoy reading the classics in the field. There was probably no more interesting and polarizing figure in the early days of Computer Science then Edsger Dijkstra, and that's why it makes me sad that so little of his work is available in print. Much of it is available online at the E. W. Dijkstra Archive, but his work really deserves a nice book series with corrections, updates, and commentary, similar to Donald Knuth's "Selected Papers" series. Many of his other earlier works, such as
3. Game Over - The definitive history of Nintendo. Goes into more detail about the business end of Nintendo, including the various lawsuits between Nintendo and Tengen, Universal, etc. than you imagined was possible. The current edition is about 10 years old at this point, and it has been out-of-print for about 8 of those years. Since Nintendo's story has changed so dramatically during this time, a new expanded edition only makes sense. Video game history/culture books in general have a very spotty record of staying in print, and there are many more that could stand some sort of reissue (Power-up
Music -
1. Bloodless Pharaohs
2. Oingo Boingo: Good For Your Soul
3. The Smiths: Thank Your Lucky Stars - A bootleg taken from the same tour as Rank
Video Games -
1. Mega Man Mania - A compilation of the 5 original GameBoy Mega Man games with bonus features. Originally announced as a Game Boy Advance release in 2003 to accompany Mega Man Anniversary Collection
2. Virtual Console for DSI - The release of Mega Man Mania would be a moot point if Nintendo would finally release some sort of Virtual Console on DSI. There are hundreds of worthy games on Game Boy/Color/Advance, Game Gear, Lynx, Neo Geo Pocket/Color, Wonderswan/Color, and other portable systems that deserve new life. Nintendo needs to make a robust Virtual Console a central feature in the newly-announced 3DS.
Toys -
1. M.A.S.K. - A 1985-1988 Kenner toy line, based around transforming vehicles and masks with powers. Probably the biggest 1980's toy property not to have a proper revival. The only M.A.S.K.-related item to be released in the US in the past several years (not counting novelty t-shirts) is the G.I Joe Specialist Trakker figure, an homage to Matt Trakker, M.A.S.K.'s leader. A full-on revival, with classic-styled but newly sculpted toys (ala G.I. Joe 25th Anniversary), DVD releases of the original shows, and anthology releases of the comics would be a big hit.
2. Sky Commanders - A later (1987) toy series, inspired by M.A.S.K. and also made by Kenner. Figures and vehicles w/ built-in zip lines. Much less well known, but no less awesome. It needs to come out again, just so people can see how great it was.
I'll post more of my wish list later. I'd love to hear your wish lists, so please feel free to post them in the comments.