During repeated excursions of the VolcanoDiscovery Europe team to Stromboli volcano in late April 2005, the volcano showed "normal" strombolian activity at medium levels:
The oval-shaped, active crater terrace consists now of 3 clusters of vents, which corrispond to the former NW (towards Ginostra), Central and NE craters (towards the village of Stromboli). During our visits, no activity other than weak steaming was observed from 3 small pits inside the NW crater. The central crater complex has two open glowing pits that were observed spattering weakly, throwing bombs to up to 10-20 m height. A third vent at the northen end of the central crater is a circular cone about 15m tall, with a small round opening, about 1-2 m large, that was glowing and exploded from time to time, about every minutes, throwing a candle-like jet of lava to about 150 m, accompanied by a loud detonation noise that caused impressive echoes in the summit area (these echoes sometimes went back and forth between the Vanori and the Pizzo headwalls up to 5 times).
The NE crater complex, heavily changed by the collapse of 30 Dec. 2002 and subsequent events, consists of at least 2 vents, of which one (to the W) is another small cone that we observed explode irregularly, at intervals of several hours, and throwing jets of lava to 100-150m, while the more active vent(s?) to the E end of the crater, not visible from Pizzo and the crater rims), showed beautiful strombolian activity every 10-30 minutes, with almost noiseless, wide sprays of lava to 50-100 m that covered the outer flank of the NE crater with bombs. During our observation times, no explosion was strong enough to throw glowing material to the steep flank of the Sciara del Fuoco.   

The crater terrace of Stromboli volcano seen from its W rim.