I like this guy at work, we talk briefly at times but not for long, how do I let him know I'm interested?

First of all, great nick! :D It had me laughing!
And you're completely wrong------guys are not turned off by women approaching them; I don't know of any guy personally that has ever complained of a woman approaching him; if anything, we are flattered, and we love it. I have nothing but respect for the women that have approached me, or have gone out of their way to give me a hint that they were interested. Even the ones I wasn't attracted to, I was nice enough to them that we either stayed friends or hung out, but I never made fun of them. So get that misconception out of your system.

The idea about dropping the number---hmmm. Kind of tacky. There are better ways, of course. The good news is that you get to see him every day for a few minutes, so that right there gives you the chance to slowly get the courage to let him know you're interested.

Now, the question is----do you see him from a distance? Is there a chance that when you see him, even for a few minutes, is it possible to still go up to him and make conversation? If this is the case, there is nothing wrong with just going up and saying. Hey, how are you doing. How is work. Maybe even give him a small compliment.
Also, as I have mentioned in other posts, you can extract critical information from him, by making small talk about other subjects. For example, talk about the news, radio talk shows, etc. Whatever it is, but what you have to find is a topic about something you want to know about him. You want to know if he is married with kids and he doesn't have a ring cause he is a mechanic? Then you can easily introduce some topic related to that and ask his opinion. For example, 'so I heard that bush is giving free money, and if you have kids, you get more. Do you think that is a good idea. '? As you can see, whatever his response is, it most likely has to be related to his life. So that's the idea, ask an opinion that relates to his life, that way you get info.
Lets assume you have the info you want---he is single and looking, then your next step is to flirt and drop hints that you're also available. How? Ask about his weekend, does he have any plans for the weekend? If he says no, depending on how 'aggressive you are' you can say, how come such cool guy like you has nothing to do. '
Ok, long post. I hope you get the idea!