yeah http://www.linmodems.org/ is a gr8 site. they have drivers or links to almost all winmodems (linmodems). If you have a lucent modem you will have to count on your luck since they don't have drivers for all lucent chipsets.
"WinModems" is actually a very incorrect term. In actuallity what you are dealing with is'nt actually a modem at all. Software does all of the modem communications for the hardware making it just an extension of that hardware. The Linmodems site actually creates Linux based software to take place of the MicroSoft software that operates these devices. A serious recommendation would be to buy an actual modem.