Most people have dynamic ip's for a start which change every 1-3 days which are then adopted by others. Personally I believe the aspect of browsing to help continue downlds or find extra material or to find a way to later connect via direct connect is an important tool to find rarer files. For those who are not after rarer files then this is not such an issue. And most of those have ip's that start with 192 which are 'arguably' impossible to trace & certainly impossible to direct connect to. These are people who are quick take & leave or are just ignorant as to how to set their system up for the type of sharing they'd envisage.

Not a clean & cut method of detecting mp3's but works for those who know "something" about how to detect differences in file size & bit-rate compared to what's expected. T3 Spammers; mp3 Bit-Rates Versus File Sizes

I'm neither a BT or Kazaa user so I can't comment there-upon.
If anybody wanted to trace you they could no matter what net program you used. Your footprints are left everywhere you travel on the net! Just ask ukbobboy01

__________________
Imagination is more important than knowledge. -- Albert Einstein
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
640 K [of computer memory] ought be enough for anybody. -- Bill Gates (1981)
The secret to creativity is knowing how to hide your sources. -- Albert Einstein
When facts don't fit the theory, change the facts. -- Albert Einstein
Religion keeps the poor from murdering the rich. -- Napoleon Bonaparte
The important thing is not to stop questioning. -- Albert Einstein
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones. -- Albert Einstein
"A composer is a guy who goes around forcing his will on unsuspecting air molecules, often with the assistance of unsuspecting musicians." -- Frank Zappa
"Tobacco is my favorite vegetable." / "May your sh*t come to life and kiss you on the face." / "Scientology, how about that? You hold on to the tin cans and then this guy asks you a bunch of questions, and if you pay enough money you get to join the master race. How's that for a religion?" / "Communism doesn't work because people like to own stuff." / "There are three things that smell of fish. One of them is fish. The other two are growing on you!" / "Jazz is not dead, it just smells funny." / "The creation and destruction of harmonic and 'statistical' tensions is essential to the maintenance of compositional drama. Any composition (or improvisation) which remains consonant and 'regular' throughout is, for me, equivalent to watching a movie with only 'good guys' in it, or eating cottage cheese." / "Remember there's a big difference between kneeling down and bending over." / "The most important thing to do in your life, is to not interfere with somebody else's life." / "Rock journalism is people who can't write, interviewing people who can't talk, in order to provide articles for people who can't read." -- Frank Zappa
"The music business is a cruel and shallow trench, a long plastic hallway where thieves and pimps run free and good men die like dogs. There's also a negative side." - Hunter S. Thompson
The shy can light the dull dark room with life when their eyes mirror their inner sunrise - LOTR