For my job I often do – testing things in Excel or in a database, providing data for students to work on, that sort of thing.¬¨‚Ć I stumbled across this site this morning when searching for something to create random (but specific) data – and it does exactly that.
You just choose fields (such as names, postal codes, email addresses, etc), fill in any specific ranges, and decide how many records you want. It then provides the data for you, in plenty useful formats – HTML, csv, SQL and so on.