About user and seo firendly urls

[eluser]PorkOne[/eluser]
Hi
Are there any contraindications to use urls such as:
http://some_domain.com/article/show/10/a...title.html ?

10 is the ID of article, "article_title.html" is ignored by controller.

What types of user (and seo) friendly urls do you use and how it works?

Thanks for help