There is a WIC for ADSL, but it only supports the following DLSAM's:
Alcatel DSLAM based on Alcatel chipset
Cisco 6130/6260 based on the Globespan chipset
Call your provider and ask them what kind of DSLAM they are using or what kind of chipset their DSLAM's are using. Also, you can do PPPOE with this router, but you need to have IOS 12.1(3)XG or better. I'd recommend 12.1.7, which requires 8MB Flash and 40MB RAM. Best of luck and be sure to post back with any more questions or config issues.