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Star Trek TNG remastered in HD, they went so far as to recreate the old CG effects which only had an SD source. Side-by-side video comparison with the old version.(r/videos)
More info and a good review here.
The first season in HD was released on Blu-Ray today, and the sales of this season will determine if the other seasons, and potentially Voyager and Deep Space Nine, will get the same treatment too.
Sadly, I can’t find a downloadable version for sale (yet). I have found torrents though and downloaded s1e06 and was amazed by the quality. If they don’t offer a downloadable version I will be ordering the Blu-Ray and then download the torrents without a guilty conscience.
Here is a trailer for the Blu-Ray.