Let say currently have url for few Mac OS X desktop and iPhone apps:<p>http://manysoftware.com/twitclient/
http://manysoftware.com/buttockbook/
::<p>Will I get more traffics and exposure to have additional dedicated domains for each such as http://twitclient.com/, http://buttockbook.com, etc? Each of these domain will host the same content as the main site.
Yes, people naturally like simplicity. If you have a small enough product portfolio, it is a good idea to have a domain that points directly to that product and market that domain. It can forward to your main domain, but have a url to a targeted brochure about that product on your main site is a good way to provide clear, simple and relevant information. For example if you go to www.mac.com it forwards you directly to apples landing page for Macintosh. www.iphone.com right to the iphone page. Now that does not immediately equate to more traffic, you still have to market your site to get people to look.