W4 Splice is a presentation manager for medium to large conferences. You load in all your powerpoint files at the beginning of the day, and use the fullscreen interface to control the order in which they're played.
Once all your presentations are loaded in, change the order, show one, some or all presentations, either back to back, or reverting back to W4 Splice between each one.
This allows you to never show your delegates a messy Windows desktop between slideshows--the W4 Splice interface is clean and tidy, lists the presentations available, along with a clock and a few options and buttons to control your day.
You can change the default logo to your own simply by replacing one file, and by tinkering with the options text file you can change the color scheme.