Multiple Domain Names
Every now and then a client wants to buy three or four or more domain names, and have them all point to a single site. The logic is that each of the domain names would focus on different keywords, and that way they’d rank well for each of them.
For example, if I had a company that made reproduction lamp shades, and my site domain was corieslamps.com, using the strategy above I might be tempted to buy tiffanylampshades.com and artdecolampshades.com and so on, and just redirect them all.
Unfortunately, it just doesn’t work that way. Here’s a post from google on the topic.
Basically it’s saying that having multiple domains won’t help and can actually harm your main site page rankings.
But what if you really want to go after those particular keywords? One options is to make specific pages on your current site that provide information about each of the specialized topics, and make sure those pages are listed in the site map you provide to the engines.
Or, if you have a lot of information on each of the niche topics, you could make minisites for each name, and put all the information there, and then link back to your main site.
Either way, it’s better than risking your current rankings for your primary site, and still lets you provide information on those niche topics.