Wisconsin DNR licenses for 2006 are now available for purchase online:
They are supposed to be vaild starting today, but you may want to carry your 2005 license through the end of March as well. Last spring, I caught some $**$#^*% from a MN CO on pool 4 for not having my previous license in possession before it had expired (this was during late March, and I had pitched my 2004 license after purchasing my 2005 license). And yes, I did have my 2005 WI and MN licenses in possession.
So, license up and be ready for the new season!