The biggest tool change is the inclusion of the SAINT vulnerability scanner. You get a one-year license to use SAINT so it technically doesn't fit the mold of the other freeware/open source tools included in Back Track 3. They've also included the Maltego forensics application, and, of course, the latest versions of the previous security testing tools along with quite a few others that you've probably never heard of but should check out nonetheless.
The following screenshot (Figure 1) shows the slick GUI interface in Back Track 3 as well as its various categories of security testing tools.
Contrary to claims by its authors, Back Track 3 is not the be-all, end-all security testing suite.
I've found over the years that many (but not all) of the commercial security testing tools provide more of what you need most of the time.
In fact, it actually takes longer to download the toolkit than it does to load it.
Once you have it up, you simply click the tool you want to run, enter specific variables or other data where needed and you're off.
In most cases, you're also going to get better reporting capabilities out of commercial tools.