Tips:
1) Speak slowly if you must. Many people are actually quite skilled articulaters and are very confident in what they are saying, but this does not mean that everything they say is important nor valid. Do not try and emulate peoples style, and if you must, speak slower and more methodical. Try not to think about speaking at all. Although, there are some professors and people quite accomplished in their field that speak slow, and choppy.Remember that articulation does not always translate to skillzzz.
2) Try and avoid thinking about what you are going to say like you are planning a paper. Also try and avoid the same language you would use. Often, people in graduate school think they have to sound extra erudite or their ideas will not fly...
3) try and gesticulate as much as possible. I know this sounds funny but body movement is important.
4) Find someone in the class, or audience, that is giving/or you know will reciprocate your ideas and give you positive feedback and acknowledgment with their eyes and with nods.
5) Most importantly, be confident. I used to think that no one cared about my ideas, but once your in graduate school you realize that we are all their(or most anyways) because we love scholarship, literature, and analyzing stuff; and it is not like undergraduate where only half the class cared.
Oy, I really need to hear some good news on the app front......