Nowdays I am in charge of database optimization on our project.
First I needed to see what the problem was, second resolve them.
So I set on a profiler in Sql Profiler. Being overmotivated I added lots of events to trace which resulted in a table with very many columns. I also did another evil thing, I set the trace to roll at 20M. This resulted in 98 trace files 
.
I tried to find some way to import them in SqlServer, but the SqlProfiler interface only allowed 1 trace file at one time to be saved as an sql table.
Well, it was hell, so I gave up importing them one by one and started to Google for a way to concatenate the SqlProfiler trace files, and here's the Golden code line :
SELECT * INTO trace_table
FROM ::fn_trace_gettable('c:\my_trace.trc', default)
You can read more about it here http://support.microsoft.com/kb/270599 .
The point is there was nothing inn the above link to mention that this line achieves this as well,so the surprise was a pleasant one.