vetteguy,
He's referring to simple registry tweaks that will result in minor performance increases; he's not talking about hacking his modem to remove bandwidth caps. Besides, I thought such "hacking" could only be done with cable modems, because:
DSL is usually a direct line to the switch, and thus wouldn't benefit from the "hack," since one is not sharing the connection with others. However, cable is shared among the neighborhood. By removing the bandwidth caps, the user is essentially stealing bandwidth from other users; that's why hacking the modem is illegal.
Simple registry hacks/proggie tweaks are not illegal at all - the tweaks actually benefit the populace since they increase the net's efficiency. Tweak away 5489!