I will use reiserfs till it is dead
My experience on 2 identical machines (dual-core, one has 4 gigs of ram and the other has 8, one uses ext4 and the other (main) uses resierfs) compiling is much faster, building siduction/aptosid is faster, the one that is really faster is building android (22 gigs). Moving files (mythtv movies etc) is also faster.
Not the best *benchmarks to test, I admit, but for me, reiserfs is faster in the way I compute and use my machine (no ssd here)
*maybe when I build my new system (8 cores, 16 gig of ram) I *might go with ext4, OTOH maybe not