(sorry about the large text, WikiAnswers works so stupidly)
"The Elder Scrolls 2: Daggerfall" - I think there is a re-issue. Hopefully there is, but I am not sure.
"The Elder Scrolls 3: Morrowind" is available for PC and X-Box.
"The Elder Scrolls 4: Oblivion" is available for PC, X-Box 360 & PlayStation 3.
Other games...
"The Elder Scrolls Adventures: Redguard" is available for DOS PC. No re-issue, so instead run DOSBox (download it or use it from the re-issues for Arena and Daggerfall), and follow instructions online. Just Google it.
"An Elder Scrolls Legend: Battlespire" is the same as before.
"The Elder Scrolls Travels: Shadowkey" is available for the old N-Gage - however there is a little fan flutter about a bootleg PSP re-issue.
"The Elder Scrolls Travels: Shadowkey" and
"The Elder Scrolls Travels: Dawnstar" are available for Mobile Phones, but require Java to run.