Every software development team needs testers, but too many companies just won't hire them. This is one of the worst "false economy" moves you can make. Read my new article: Top Five (Wrong) Reasons You Don't Have Testers.
In my chapter on affordances and metaphors, I praised tab dialogs as providing a better metaphor and better usability than the listbox/combination dialogs that they replaced. I was barraged with mail saying, "yeah, tab dialogs are great, but not if you need more than one row of tabs!" Which is true. All the designs I've ever seen with multiple rows are terrible - they're either confusing, or they violate realism in some way.
Now, you could make a good case that if you have to have more than one row of tabs, your design is too complicated and it needs to be simplified. But if you can't do that, here's a way to do multiple rows that doesn't violate realism:
You’re reading Joel on Software, stuffed with years and years of completely raving mad articles about software development, managing software teams, designing user interfaces, running successful software companies, and rubber duckies.
I’m Joel Spolsky, co-founder of Fog Creek Software, a New York company that proves that you can treat programmers well and still be highly profitable. Programmers get private offices, free lunch, and work 40 hours a week. Customers only pay for software if they’re delighted. We make Trello, which lets you organize anything, together, FogBugz, enlightened issue tracking software for bug tracking, and Kiln, which provides distributed version control and code reviews. I’m also the co-founder and CEO of Stack Exchange. More about me.