If you're developing software for a government agency, a bank, The Church of Scientology or some other ultra-sensitive place, then an Easter Egg probably isn't the brightest idea.
Otherwise, go right ahead and sign your creation, provided that it's (a) non-offensive (b) non-intrusive and (c) as loosely coupled to the rest of the app as possible. I've added Easter Eggs to most of my software (ex: type "FeedDemon easter egg" into FeedDemon's address bar), and years later I've always been glad I did it.
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If you're developing software for a government agency, a bank, The Church of Scientology or some other ultra-sensitive place, then an Easter Egg probably isn't the brightest idea. Otherwise, go right ahead and sign your creation, provided that it's (a) non-offensive (b) non-intrusive and (c) as loosely coupled to the rest of the app as possible. I've added Easter Eggs to most of my software (ex: type "FeedDemon easter egg" into FeedDemon's address bar), and years later I've always been glad I did it.