Okay on your main domain you have a site about flowers and on a sub-domain you have a site about cars. Is there a problem with this for SEO in terms of the main domain?? To cut the long story short, I created a sub-domain for the purposes of practising me skill, but this site is now a fully functional site. However I am now ready to develop the main site which has nothing to do with the sub-domain, is this a disaster?
i haven't seen any one complaining or having any problem with different site for main domain and sub domain nor google says any thing about this.
can't understnd what u r doin!! you are jus loosing your PR and your traffic by linking two domains of totally different topics. Google dosnt penalize u for dat bt 4 ur own sake, for your site's better optimisation, i dnt thnk it is fine. m totally disagreed wid wat others(people in favour) r suggesting u
No problem from SEO point of view but you have to promote both main and sub-domain individually for getting traffic and rankings.
...then: My subdomain is 80% developed, PR2 My maindomain is not linked to the subdomain. It is NOT developed and is only one page, but some how has been given PR2 also. How? I have another page running off teh maindomin and it now has PR1, how? No SEO done for maindomain!
I would grab a separate domain. You can redirect if you've already started a link building and traffic campaign.
....can you please expand on the above. So you are saying abanon my main domain, get a new domain and just do a 301 redirect from the old one? Why?
I'm suggesting you get a new domain for the car site, instead of it being a subdomain on an unrelated domain. Personally, I prefer to keep separate websites separate.