@jesa: month view uses a different page structure from daily and weekly views, so for now the script ignores month view. If it's something people would really like to see I could work on supporting it.

Thanks Dogwalker.

Sorry to anyone who was waiting for a long time for me to get in the change. Every time google updates their javascript, the funtion name changes, breaking the script.

@bobielawlintine: The recent security update for greasemonkey broke my system for storing your prefrences over a refresh. I'll try to get a fix in soon, but for now you can open about:config and change the value of the key with a name like this:
greasemonkey.scriptvals.http://www.hmc.edu/~mjeffryes/GCal Event Color Codes.is_on
to true to have the color codes stay on when you refresh the page

@CyberCPA: you might double check that the @include patterns match the url for your google calendar. I may not have gotten them all.

There, now all day events should color code just like regular events. Let me know how it works for you.

I changed the script to support the new code again. All day events shouldn't be too hard to add, just need to search for a different set of divs.

Also, for those of you who want to know how to update the script yourself when google updates code, it's not too hard:

- Get a copy of the big Google calender js file with most of the application code using firebug of the like.

- Search the js file for '("eventowner")' space out the function containing the first hit. Looks something like this:

function Wb(a){
try{
if(!mm){
var b=n("eventowner");
if(b){
b.innerHTML=l
}
n("calowner").innerHTML=l;
if((z.V()&1)==0){
n("allDayGrid").style.display=B
}
hd();
eo()
}
if(!Wj){
Xb=[]
}
Yf();
RE();
YE();
ea("refreshMode = "+nm);
if(nm>=100){
WE()
}
if(!a)
VE();
UE();
OE()
}catch(c){
tc(c+"\n\n"+c.stack)
}
}

- Replace the old 2 letter function name with the new function name in the insert and uninsert functions in the color-coding script.

If that sounds like too much work, you can just wait until I post the fix, usually no longer than a few days.

Posted a new version which works with the changes in google's code.

Unfortunately, every time google posts a change to their source, their compiler changes all the function names, breaking my hooks which call the coloring code. I love any suggestions for ways to overcome this weakness in the current design.

Thanks for the comments.
@Philip:
I personally prefer to us "!" but if there are several others who'd like it to be "#" I'll change the code. Since it's just a simple find/replace, it should be easy to use any flag you prefer. I also like to use the button, simply because I occasionally need to flip between comparing calendars and comparing the events in the calendar. Maybe you could post your variation on the script and we could just cross-link them for convenience.