I have an A620, I've had it about 6 months or more.
Here's an image, very small but you can see the dot. This is the bottom right of my viewscreen when taking a horizontal photo. I do see the dot on my viewscreen when composing the photo also.
Exif for this photo:
7.3mm, F/7.1, 1/250
Could this be on my sensor or is it more likely on my lens? The lens looks clean but I have not cleaned it as I do not have any cleaning supplies. Which leads me to my next question. What is the best way to clean the lens of a compact camera?
Thanks.

One thing I do know is that it is a small dark dot at that focal length and then at a higher focal length it is less in focus and is not as noticable, which makes me think it's on the lens. (Might have answered my own question there. 
