Microsoft Applies For Patent On Private Browsing
PhilDEE writes "Microsoft is in the process of applying for two patents for a private browsing mode in their next version of Internet Explorer — a feature already present in Safari, among other browsers."
The trademark identifies the manufacturer, and their reputation gives me an indication of the quality of hidden components. If it's a Sony, it'll probably hold up for a while - if it's an apparently-identical Daewoo, it'll probably die the day after the warranty runs out.
Your point about common words and colors is valid, but that just means there needs to be better inspection, auditing, and reexamination procedures - not that trademarks aren't good in general.