Great stuff, Josef! Handling the input is very easy, just click the cards of choice for the input field having the focus (yellow background), and press "Calculate" to compute the odds, resp. to finish dealing out. You can also undo/redo any action.
The odds calculator uses a brute force approach. It looks quite fast, considering the fact it needs to process millions of combinations before the flop, and finishes in about a second on my PC. You can take a closer look at the code as well - it's open source.
My blog stylesheet won't resize the content area's width, that's why the applet is cut off on the right side, otherwise my navigation panel would have disappeared (I'll probably ask Josef to let his LayoutManager do some resizing instead, so the applet will fit within smaller screen estate as well). You can see it here in full size.
The applet requires Java 5, which - if missing - should be installed automatically on MSIE, I hope also on Firefox (for Mozilla browsers I had to replace the <embed> tag by an <applet> tag in order for it to run at all inside a blogspot.com page).
And by the way Josef, here are the odds for our game last week, when you went all in. Sorry to mention that 84% sometimes still is not enough. ;-)
Update: Some proxies seem to filter away <object> tags altogether, so I replaced it with an <applet> tag for all browsers.