As of today's release of chrome (Tuesday, March 8, 2011) on both Mac & PC the settings are now in a tab (chrome://settings/advanced), needless to say when you're clearing your cache very frequently (cmd-shift-delete on mac, cntl+shift+delete on PC) it's quite tedious going back and forth in tabs. The click & clean chrome extension doesn't have a mac counterpart (plus I like the keyboard much more than the mouse). I've searched and have yet to find a way to get a dialog box instead of the new tab.
The Clear Browsing Data overlay does not work and is a known issue, and they're working on fixing it. Even so, it's still not as convenient as the dialog was.
You can start Chrome with the
--disabled-tabbed-options command-line argument to use dialog options instead of the tabbed options. You'll have to add it to the command-line in your Chrome shortcuts.