Do blogs affect web optimsation or ranking?

Blogs and web optimsation

[Tinkerbell2000]

Currently we are thinking about adding a blog page to our information website Can this affect website optimsation and rankings with searchengines in a negative way.
What are the positives for blogging?

Also is there any method of controlling and monitoring the text that bloggers input.

[Frida]

the blogging pros are more than the cons and I am not the only one who will say that.

[jtara]

Also is there any method of controlling and monitoring the text that bloggers input.

Not quite sure what you mean here. YOU are the blogger, right?

Are you referring to comments that members of the public can leave for each article? Most blogging packages allow you to either shut them off or require approval prior to their appearance.