There's nothing wrong with taking a bow, and being able to put your name on something and say "I did this" is one of the strongest motivatores i know of to get people to take pride in their work, and value it's quality.

For decades programs have had "About" commands/screens that give you info on the program, and frequently who developed it -- i see no reason why WWW based applications should be any different. Having an "About" link at the top/bottom of every page of a WWW based tool might be considered to obtrusive by some, but It's perfectly reasonable to put a small link at the bottom of the front page / spalsh screen / login page for your app.

And if the higher ups at your company are really anal, just remember: easter eggs don't have to be very obvious, and spending an hour on an easter egg that only 1% of an apps users can be more encouraging then spending 5 hours on a high quality credits screen that 99& of the users see.

(I know from experience that if you embed an ascii art photo of someone in your source code, and display it only when someone clicks on a 20x20 transparent gif floating in the margin of your page, no one ever notices it when installing your software.)