Users who have the Alexa toolbar installed are monitored to see what site they visit. This data forms the Alexa rankings.
If you want to inflate your Alexa ranking you can install the toolbar. Of you could build some real traffic and make some money that way. Alexa is like PageRank. Meaningless but people like to look at it.
Yes, there is one: http://www.quirk.biz/searchstatus/ And since it uses the Alexa API, it will even affect your Alexa rank positively (I observed it on one of my sites!).
alexa updates the ranking by considering many factors in to account they may be visitors,pageviews and all..........
Alexa ranking are easily inflated... as it was said, mostly useless, but something pretty to look at.