I think it's a good idea, I'll start adding them soon.
It would be good for people who prefer just one of the methods, and often the video isn't complete or people just prefer to read the item names or whatever.
I think for the text walkthroughs we could put them on a separate page, put under the page's directory i.e:
Do you mean we should make a whole new page for each level's walkthrough? We could do that but I don't really see a reason to do it.
Not a proper new page but a 'sub page' which is what the pagename/subpage bit is. But only if the article length increases quite a bit because of it. Particularly the Croc 2 walkthroughs.
OK, then it sounds like a quite good idea.