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If you had said CPU or disk, that question would be very easy. Variations of the ps command could give you what you need.
I/O is much trickier! You'll need to do some work here -- there is no one magic command, though I'll mention a neat one at the end.
I like to try a variation of ps, iostat and lsof to determine what is eating up my I/O resources. You may need to download this utility from a site like http://www.stokely.com/unix.sysadm.resources/shareware.www.html.
iostat will give you a sense of what disks are busy and lsof will tell you what files are open at a given time and the placement of the files by filesystems and/or directory. Variations of the ps command will help you identify the top running processes on your system.
Did I say top? If your system does not come with it already, you can also get a copy of TOP, available for Solaris and Linux, that will also identify the top running processes on your system. From there, with a little more work, you should be able to find the I/O hogs.
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