What is the Good URL structure for Blog posts

[Michael.Leonard]

Please let me know what is the goood URL structure for blog posts

http://www.abc.com/postname/

or

http://www.abc.com/�tegory%/%postname%

If Category, Can we name it Blog like website/blog/postname or it is good to use actual categories, and How many categories we can use?

[EGOL]

I would not use /blog/ in the URL.   Attracts spammers and hackers and weasels like bugs to a Georgia porch light.

[4RS_John]

Is there a good way to avoid it on for a blog that's part of a larger site, (the whole site isn't a blog - and couldn't be powered by a blog CMS like WP - but we have a blog, currently on a subdomain)?