Chumming can be very effective form the shore too. The two places that jump into my mind are Castle Hill/Brenton Reef area in Newport on the outgoing and an area east of the Sagamore Bridge on the cape side on the east current. The big Clam bricks John mentioned are nice. Herring and pogies make good chum. the herring you can get youself in the spring. Mike T at M+D's in Wareham sells nice fresh pogies in season and some of them chopped up saving all the juices works well. I think its important to prepare your chum such that all the juice gets captured in the bucket while you chop it up. Use the guts and everything. Some people chum and then chunk the bottom with bait and sinker (at Castle Hill for instance) and some people chum then drift unweighted chunks out into the chum slick ( common at the canal). I seldom chum per say but we will often chop up and throw out used dead herring in the spring. I do like jigging down current from the guys chumming and bait fishing. You can be pretty far away from the actual spot that was chummed and still get fish way down current. be careful wading near someone who is chumming. Chum brings in other species besides stripers and blues.
