If i am running a website which has nearly 50 pages and all are related to Bluetooth Technology.And now i want to publish some contents related to "Nudges" of msn messenger. Yes this is entirely different topic. So i am asking here whether it is good according SEO prespective to buy new domain,hosting .... Or there is no difference i can use SUBDOMAINS feature which is already in my hosting package and having lot of space as well. I will appreciate your comments.
My personal rule of thumb: If it's different but related content, then a subdomain has a lot of advantages, including branding and avoiding the sandbox. If it's different and unrelated content, get a new domain and set it up as an entirely separate website.
if its something u feel has potential then a sub-domain is the easy route (avoid sandbox for new domain etc) however if it does rele take off then you will end up buying a domain for it anyways, so you then have to transfer the pages, pr, backlinks etc and waitout the sandbox. where as if you buy the domain now you could instantly begin getting links/pr to the new domain and wait a few months and have an un-sandboxxed site too.
You don't have to submit to search engines at all but if it makes you feel better you can submit anything you like. How Do I Get My Site Listed on Google?