As part of my thesis work, I had to use the latex typesetting system to create the slides for my presentation and for typesetting the thesis report. Though I have used latex before, this was my first significant effort in that direction. To have a look at my thesis report or thesis talk or the latex files that I wrote for generating the files please have a look here.
On the other hand, if you want to learn latex quickly and get going in creating simple documents, then have a look at this page on my blog.