well i am going to link a few threads i just found by doing a simple search on the this site..
ext3 vs reiserfs poll & comments
someone claiming reiser is faster, plus others views
reiser vs ext2/ext3
and for what its worth here is a benchmark
between ext3 and reiserfs that i found browsing around...
i only quickly briefed it, but by glimpsing at the charts it basically says that reiser is faster with bigger files and ext3 is faster with smaller files...
with that said you'll notice with some peoples comments in the above 3 links i gave, that they say reiser is now faster with smaller files...so you can be the judge of the info you read ;-)
oh and don't forget there are other filesystems that you may be interested in, and you can go to www.google.ca/linux
to find some info about them, such as XFS, or JFS ...