Here is a cool tool to help advertisers see how their ads are shown on Google. Check it out at the following link; it is referred to by some as the “Ad Preview“.
I recommend you use this tool instead of you (or your colleague or clients) going on Google and searching for your ads. This way you don’t add unnecessary impressions to your keyword/ad performance.
Along the same lines, clients often ask why they can’t see their ads on Google. Here is a recent post on Google’s Inside Adwords blog that addresses this issue.
Hope you find this useful!