Where Can I Find Latex Templates for Presentations and Posters?

[Ravian]

Can some one provide me a latex template for presenting a seminar. I have downloaded few templates but they require infinite numbers of .sty, .def etc. i try to download all of them but they never finish, also if someone can provide me latex poster template also.
thanks.

 

[DrDu]

I use simply the "foils" package. Easy for presenting formulas and graphics not so good if you want to impress with colorfull slides with many frames instead.
For posters A0poster: http://www.ctan.org/tex-archive/macros/latex/contrib/a0poster/