When deciding on where and how to host your blog consider the following.
If you have the choice between:
- myblog.someotherguysdomain.com
- myblog.yourdomain.com
- www.yourdomain.com/myblog
Use www.mydomain.com/myblog.
This will improve the ranking of yourdomain.com. Why put the work in to build the reputation of someotherguysdomain.com when that effort can go into building yourdomain.com?
So why is this blog on blogspot.com not GalaxyWebsiteDesign? Well, if you use more than one blog to increase the width of your profile on the net they can’t all be on one domain. :)
And, yes, having more than one blog can be one way to increase your profile on the net. Just be careful to not spread yourself too thin and/or over commit. Because I have different clients that ask for help on specific blogging software, I maintain blogs in several parts of the web — so that I can experience first hand what my clients are going through. Thus, at the moment, I am not heeding my own advice and I’m spread a little thin. :)
In any case, given a choice, have your blog be a subfolder of your domain.