why differences in domain names?

[Armivanbuuren@hotmail.com]

you are right,in some English speaking countries the we can guess the basic type of the site.
but in some other countries the domain will just be of no meanings at the first sight

[Plusplushosting-mike]

There is no denying the fact that you will have nice advantages having .COM domain..
Your domain should be Catchy, Short and memorable.

[SiberForum]

Actually you can use any domain name extension you like. But you need to remember about your visitors and that is recommended to make their life easier in order to remember your web site.

[seo125]

It is very simple, when somebody goes to google and type, yourdomain

will type: yourdomain.com instead of any otherone. first