[ArteGordon]

very nice indeed. One thing you might consider is adding in a property that indicates which entry has just been matched.
With that, external agents like the xmlspawner can monitor the conversation as well and trigger when they reach a designated state.
I just threw in that minor mod and it works great for setting up mini-quests and for conversationally triggered item/mob spawns. More flexible than the fixed keyword triggering.

private int m_CurrentMatchedEntry;

[CommandProperty( AccessLevel.GameMaster )]
		public int CurrentMatchedEntry
		{
			get { return m_CurrentMatchedEntry; }
			set { m_CurrentMatchedEntry = value; }
		}

private SpeechEntry SelectEntry( string speech )
		{
		    CurrentMatchedEntry = 0;
			foreach ( SpeechEntry entry in m_Speech )
			{
			    CurrentMatchedEntry++;
				if ( entry.Match( speech ) )
					return entry;
			}
			return null;
		}

although it is admittedly something that people could just add in if they wanted to do that and if you put in sequencing you would probably end up with a prop like that anyway so more of a minor consideration.