Kev: Try the java 2d applet instead. The error below most likely means you've got either no or out of date opengl drivers.

Windows xp , ie 7, intro screen displays, I click to start, get the hourglass type animation, and then nothing. Error in console:

Java Plug-in 1.6.0_05
Using JRE version 1.6.0_05 Java HotSpot(TM) Client VM
User home directory = C:\Documents and Settings\Duncan
----------------------------------------------------
c: clear console window
f: finalize objects on finalization queue
g: garbage collect
h: display this help message
l: dump classloader list
m: print memory usage
o: trigger logging
p: reload proxy configuration
q: hide console
r: reload policy configuration
s: dump system and deployment properties
t: dump thread list
v: dump thread stack
x: clear classloader cache
0-5: set trace level to
----------------------------------------------------
Mon May 26 12:52:48 BST 2008 INFO:Clear up
Unloaded C:\Documents and Settings\Duncan\Local Settings\Temp\www.cokeandcode.com\Putty\natives\lwjgl.dll
netscape.javascript.JSException
at netscape.javascript.JSObject.getWindow(Unknown Source)
at org.lwjgl.util.applet.AppletLoader.init(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Mon May 26 12:52:53 BST 2008 INFO:Slick Build #230
org.lwjgl.LWJGLException: Could not find a valid pixel format
at org.lwjgl.opengl.WindowsPeerInfo.nChoosePixelFormat(Native Method)
at org.lwjgl.opengl.WindowsPeerInfo.choosePixelFormat(WindowsPeerInfo.java:52)
at org.lwjgl.opengl.WindowsDisplayPeerInfo.initDC(WindowsDisplayPeerInfo.java:54)
at org.lwjgl.opengl.WindowsDisplay.createWindow(WindowsDisplay.java:158)
at org.lwjgl.opengl.Display.createWindow(Display.java:299)
at org.lwjgl.opengl.Display.create(Display.java:848)
at org.lwjgl.opengl.Display.create(Display.java:800)
at org.lwjgl.opengl.Display.create(Display.java:782)
at org.newdawn.slick.AppletGameContainer$ContainerPanel.start(AppletGameContainer.java:147)
at org.newdawn.slick.AppletGameContainer$1.run(AppletGameContainer.java:68)
Exception in thread "Thread-75" java.lang.NullPointerException
at org.newdawn.slick.GameContainer.updateAndRender(GameContainer.java:489)
at org.newdawn.slick.AppletGameContainer$Container.runloop(AppletGameContainer.java:412)
at org.newdawn.slick.AppletGameContainer$ContainerPanel.start(AppletGameContainer.java:153)
at org.newdawn.slick.AppletGameContainer$1.run(AppletGameContainer.java:68)