Being a College professor, I'll give you the following advice:
if you don't know exactly which MS thesis title to choose, then first of all choose your advisor, i.e., the professor that's going to supervise your work. Ask him which would be his preferred title. May be he's thinking of starting a research work (or is already involved in one) and will take care of you in every possible manner, because you'll do a job he's interested in. A professor that's not directly interested in your work won't possibly give you as much attention.
Besides there are two other things in favor of this opinion: the first one was pointed by HgTX, i.e., the possibility of a financing of your research; the second, that your MS thesis becomes a paper presented by your advisor AND YOU before a technical conference.
Giovanni S. Crisi
Sao Paulo - Brazil
What's the situation? Are they really free to pick whatever they want? Who is funding the research?
I was given no choice whatsoever in my MS topic. There were certain projects that had been funded, and students were assigned to different projects. We did get to express our opinions as to which projects we'd prefer, but that was about it.
In programs like social sciences or humanities, where "research" is a thought and library exercise and doesn't involve expensive equipment or materials, it makes more sense to be asking about what a good topic would be. I've been through that side of it too, and had a hell of a time coming up with something. My biggest problem, though, was that I didn't know how to use my thesis advisor to help me channel my interests into a workable topic (and said advisor was not forthcoming with said help; that is why I have an MA and not a PhD, and also why I am now an engineer and not a linguist). A good advisor will be able to tell you if your choice of topic has been done to death already, or will not be of interest, or will not have practical application, but can also show you how to pick a related topic that is still interesting, or focus your topic in a different direction than you were originally thinking, in order to get something workable.
You could look at the sources provided to see what other people have researched--but the problem there is that you see what other people have already done, so it's no longer something new for you to use. But if you pick out a few that look interesting, your advisor should be able to use those to figure out where your interests are and what might be a good topic for you.
But if *you* are the advisor, that's a different story...part of the burden of being a faculty member is knowing the field well enough to know what makes for good research--and getting the funding for that research.
Hg