Can I watch an HD-DVD in my Macbook? / In a regular DVD player?

No...You need to have a player that has that capability. If by HD-DVD you mean Blu-ray, then you need a Blu-ray DVD player or a PS3, and you can play regular dvd's in those players. If you mean HD-DVD, that is the technology that Blu-ray beat out, you would need a HD DVD player or a Xbox 360 w/HD DVD player attachment.
 
No you will need an HD dvd player. Since Hd dvd's are a different format.
 
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