I tried Benchmarking these, but it's just too fast to get much of a feel for what's going on inside. I'm guessing that the speed difference between the two is pretty minimal.
Nate's in the mainstream of Good Perl Taste here. while is good for loops and reading from filehandles, while foreach is good for iterating over some sort of list, whether is is the keys of a hash or the elements of an array.
If you're *really* into cool things, don't forget that you can do this.
$_ (the current line) is assumed in those contexts. Neat, huh?
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