I don't think the wayback machine is very useful with this problem... you mean I could use that, when I've found a web page, to check how old the page is? Sounds like a lot of hassle, especially when it shouldn't be me doing the work in the first place.
I just ask, if you put a document online, insert a date of creation into it... can't be so damn difficult...
And modification date.
It's unbelievable how so many pages don't have them. I've seen how even companies which publish news at their website don't have dates in their news articles.
And the same with many websites which offer software for download - not even a hint of how old the software is! No versions, no dates, nothing. And I am supposed to download
their software? I see this way too often.
Argh.
I'm in fact doing often nowadays that I just throw the whole page away, if the date would be relevant, but it isn't there. So I get a bit angry and close the page and never go back to that website.
Hey, I know a good website.
http://www.useit.com/
Jakob Nielsen
"Jakob's column on Web usability"
I think every professional and aspiring web developer should read his articles. I'm not saying he is always correct, but I think there is a lot of good advice there at his website.
No, I am not Jakob Nielsen

sounds like Danish... I'm Finnish.