Yes, the owner (or the lady with the hat, anyway) used to post here on occasion. It has any number of good maps and info, it is heavily biased towards the more commercial and established operations.
Update: I'm currently thinking of staying at the Manta Lodge as they have a 'breakfast package' as mentioned above. Only problem is that their "dive" package only includes one dive per day?
Shop a bit harder. Manta Lodge is a good place to dive with, but I think you might do better prices for lodging at a guest house in Speyside... breakfast included.
All dive package prices are quite negotiable. Go in knowing what you have in mind. When we arrive at such a similar destination, on the first day we'll look over the recommended dive-ops pretty quickly and if we are interested, we ask... how much for a dive? Then how much for 5.
Then the question we really want to know the answer for... How much for 3 a day plus a night dive each night?
Negotiate on scene, with cash. Pay it out as you go. Unless something unlikely and awful happens, keep to your bargain.
Because of the limited infrastructure (boat sizes, tank reserve, etc) and the bias towards European style diving, you are going to find a lot of single-tank boat dives, with the dive boat returning to shore after every dive.
Understand that "North End" operations in Speyside inhabit an entirely different world and business model than the firmly established business concerns on the South end that have catered to Cruise Ship divers for many years in Crown Point/Pigeon Point.
The American dive model of dive-dive-dive is not unknown to Tobago providers, but the bulk of their trade is British. Two-a-day is fairly common. They might
offer three boats, but if you watch the clock, it can be a real hump for a Nitrogen Junkie American to get himself seated on all three departures. Factor in a lunch there and you are running at a quick pace.
I would get there and then bargain for your dive packages. Again, not for the feignt of heart, but I would check out Red-M (Red Man) dive op, just South of Manta Lodge. I have often stayed right next door at Speyside Lodge with good success. Lots of options are available.
Get lined up for a traditional Caribe slave food, the Roti. It is a mix of Asian and Caribbean, with chick peas, curry, indecipherable pieces of chicken rolled into their burrito, their national "big mac" if you will.
Then there is
Carib Beer 
where the stirring tag line is splashed everywhere in
blue and
gold,
"Caribe- is a beer".
I guess some of the excitement gets lost in the translation.
Maybe not.