Yes, you can overclock laptops. You can usually use software to do it on old laptops (I prefer SoftFSB, but you have to figure out which clock generator your lappy uses). You can often jumper old Pentium laptops to a higher multiplier as well. And if your lappy is Socket 7 and support Mobile MMX processors, you can usually just stick a K6-2 into it, running at 1.9v core and 400 or 450MHz.
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<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>