there are many CMSs that you can use, but it depends on what you need!
Learn more about that here:
http://www.designblab.com/cms/the-best-cms-for-you/

For a company website that is simple, use Joomla. Quick and easy to build. If not, try LifeRay - I have not tried this but it could be good.

also, you can find hosting/domain providers using my website.

getting domain+hosting from the same company is fine, but:

1) make sure its a well known company (in which many cases we will not know)
2) as long as you have full control over the domain. (ownership, etc.)

sometimes companies dont want you to change hosting companies so they refuse to release your domain after a quarrel.

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Added on January 10, 2009, 3:24 amEDIT: note that it happens not very often, but it does happen. most companies release it - some after a lawyers letter.

This post has been edited by djzen: Jan 10 2009, 03:24 AM

yea, they support joomla. at the same time you can install blogs and forums too