I used to work as a Training and Safety Manager in a previous job, a lot of my work was done with new starters into the company i worked for, so i used to come across the interview part often.
As Others have said, for any others going for interviews, be confident, talk clearly, try not to, erm, uhm, etc.
But most of all be prepared - If possible ask for a job description prior to your interview, then read through the key skills required for the role, and set out where and how you've come across these in previous jobs or general day-2-day life - For example; Tell me how you've dealt with a customer complaint and what did you do to resolve it.
Don'tbe affraid to bullsh*t a little - I always do... But remember if you're spinning a beard, think the story through first in your head, picture it as if it actualy happened, then when you need it for the skill set etc, wheel out the beard..!
As Dazmo said, i enjoy interviews, but then i used to enjoy public speaking as i thought i was a bit of a comic once up there!
I went for a job a few years back for Group4 as an Area Manager of some sort - great money, well above my normal role. Smashed the interview by spinning them what they wanted to hear.
The Woman from the agency that put me forward, rang and told me - The job is yours, just pass the online test and thats it - I failed it... lol Fractions ***... Bad times