Here is an intereting article from the Nevada Business Magazine written by Bruce N. Willoughby
Here is the link on... How To Avoid Having A Mechanic's Lien Filed Against Your Property by Bruce N. Willoughby (Should open in a new window)
Whenever you have work done on your home, landscaping, putting a pool in etc.. get a lien waiver for the contractor. Read the above article for some great information on the subject.
UPDATE:: Of course to avoid a lien being placed you should of course pay the bill and once done make sure you have the proof you paid and get the lien waiver from the general contractor and any subcontractors who worked on the job. See comments below of examples of what can happen.

Interesting, but if people would prove responsible in paying for services rendered the mechanic's lien would be moot.
I had never dealt with someone who had a mechanic's lien until now! They have a mechanic's lien due to the installation of their pool. Vickie is right! If people would just do what they should...pay for what is owed...the mech. lien would be unheard of. Thanks for the link to the informative article. :)
Vicki,
You are right, I should have started with..Pay the bill..LOL..
Sonja,
The pool lien is one that in years past had been as issue here.
I haven't seen it in a while, but what would happen is the owner would pay for the pool, but during the process the contractor may have put a portion of the bill on the property as a lien, (even when draws are done) and then did not go back and have it removed once the owner had paid the bill.
Good luck!