MySQL Log and Data directories

[dbrb2002-sql]

On a high read/write load.. is it good to split log (binlogs, innodb txn logs) and data
(all tables, innodb tablespace) in different partitions ?

Anybody had any experience ? 

For example; out of 25 disks array with 142GB 10000rpm... I would like to keep few disks
to logs and rest to data .. is it advised or better to keep everything in spool so that
all spindles can be efficiently managed...

Thanks in advance