That was fast. Via Google Blogoscoped word that Google Catalogs, you know, the one that went offline last week, is now back online. The wonderful Phillip L. even has a screen cap that shows the new and old interfaces.
My post from last week has a bit on the history of Google Catalogs and how the database grew stale over time.
At one point, Google Catalogs contained about 6,600 catalogs. The new Google Catalogs site does not list the amount of catalogs listed in the new database. The advanced search interface remains the same as what was available before the retooling. However, I did notice that at one time the advanced interface offered a SafeSearch filter that you could use on a per search basis. Here's a screen cap from 2004 that illustrates what I'm talking about. The current advanced interface does not offer this search option.