I usually think entice has to do with attracting someone or something, and seduce means they are already with you, you convince them to agree or do something... in a pleasurable way. Usually this has to do with sex, but it's also common to see "he was seduced by the bank's competitive loan rate", for example. Still sounds saucy!
Turns out that "entice" had an old meaning of stirring up a fire, and "seduce" originally meant to lead someone astray... the -duc- part is the same as in "educate" (lead out/lead forward).
www.etymonline.com is very useful, anyone know any similar sites??