So here is a real annoyance with Salesforce.com that I'm sure many of you have seen. When clicking in a date or date/time field, you get this nice little date picker. I have no problem with a date picker, and theirs works pretty good in many cases, but lets say you want to add a date field to an object for a birth date, or something that is far in the past. Look at the picklist for the year in the date picker. You only get a half dozen of so options and most of them are in the future.
Now, you could just select any date, then go into the text field and change it, but some users just don't understand that they can do that.
Truth be told, this is not so much a fix as it is a hack, but it's a good stop-gap solution until Salesforce.com comes up with a solution. It involves injecting some jQuery into a home page component to modify the year picklist in the date picker.