Programmatically getting tags (keywords) from titles, descriptions and related items

Programmer Question

Hi all,

First I need to programmatically get tags (unlike what is done here on stackoverflow) from the titles and descriptions of my posts. I don't want commonly used words to appear in keywords. Is there an efficient way of doing this?

After getting good tags, I would like to save them in MySQL DB.

Now, how do I efficiently get related posts using these automatically created tags? E.g. What is done here.

Find the answer here