Anyone know the format that is most spider friendly? does it even matter?

ex:
http://www.site.com/page/2

http://site.com/articles/60163/Knock..._Run_Over.html

??

Generally static URI with keywords (your second example) are better than numeric ones (your first example).

Yup I am with Lucas, but all you really need is the keywords, the first one would be ok if it had some keywords in it.

Oh and dressing it up in a suit and tie would be good as well

Definitely switch from underscores to hyphens.

"hot_babes.html" is optimized for "hot_babes" -- as one word.

"hot-babes.html" is optimized for "hot babes" -- as two words.

The underscore is not a value word seperator.

Not a lot of people search using underscores.

Right, like Will, Lucas and Illusion mentioned, you want to include keywords seperated by anything except underscores, as search engines don't "split" them correctly. some-thing, some,thing, and some;thing will all work for "some thing", while some_thing won't. Also, you might want to keep the url stub static, ie. when you are not using id's to get the content (site.com/blog-post.html instead of site.com/13-blog-post.html) don't update the linked url when editing the title. Using .html or .htm to "indicate" static content is not necessary, as no search engine cares about that.

Id go for site.com/keyword1-keyword2.html its usually a good way to go.

But then thinking site.com/category/keyword1-keyword2.html would maybe be better in the long run because the category keyword could be just as important and be nice for different keyword related searches.