SEO naming techniques for generating static HTML files

1, the depth of the folder should have an impact on SEO it?
2, a lot of folders (files) will access to the system is slow, and difficult to manage?
If it is a small site, or less classified, you can remove the previous/html/way
Put it directly into the system directory. Take such a way:
System catalog
------xinwen/2009/file. htm
------jingji/2009/file. htm
------guoji/2009/file. htm
------bendi/2009/file. htm

Because there are fewer categories, the root directory cannot be placed in many folders
I see a lot of systems, in order to create a folder for SEO situation, is a news clip, such as
------bendi/2009/guodegangsongzudeduima/actually inside is a index.html
said that this optimization is conducive to SEO, but I do not like, I hate to see a folder below a good thousands of folders, and then there is only one file.

For file naming, I do three ways:
1, time stamp + random four bits (if not considered acquisition, can not be added immediately, because the acquisition may be a time of things)
2,id
3, automatic generation of Hanyu Pinyin, such as guodegangsongzudeduima.htm (this is to determine whether the same category, the same year the same title)