How to make better URI

It should be as short as possible. Don’t sacrifice consistency or obviousness, but be brief.
Organize and name things logically. ASP.NET isn’t always helpful in keeping a clean structure, so I highly recommend that you use a URL rewriting module. URIs should be ‘hackable’ – see http://www.useit.com/alertbox/990321.html.
URIs should be deterministic.
- No two URIs should ever display the same page
- The same URI should always display the same content.
The query string should only contain data that AFFECTS THE QUERY. If it doesn’t describe the content, it doesn’t belong.
The URI path should not rely on cryptic or numerical identifiers. If it does, it should also provide a human-readable title. It’s really nice to be able to look at a URL and guess what it contains – especially when you have a long list of them. As a bonus, search engines absolutely love URIs that match keywords. Tip: Don’t try to spam URLs with keywords. Density algorithms are applied here, also. As with page titles, pick exactly 1 keyword and stick with it.

Further reading (written by Tim Berners-Lee): http://www.w3.org/Provider/Style/URI.

Bad examples:

Better examples:

/Default.aspx?tabid=3&title=ContactUs
/Products/ShowProduct.aspx?id=4982&product=Nokia_Wall_Adpater_12V
/showblog.aspx?articleid=98&title= Why_you_should_never_concatenate_SQL_commands

Best:

Reference