amznVibe - 11:45 am on Oct 27, 2008 (gmt 0)
Hackers can't scan millions of sites like Google can so easily.
Instead they use search engines to find patterns on words on a page ie. "powered by WordPress"
It's fairly easy to defeat those patterns, any SEO worth their salt can easily figure it out.
These patterns are in your themes, not the core, so they are safe to change.