So you want come to my country eh? Nice.
To desmistify, that video on my blog is from 2 australian anglers in Australia

It's there, in portuguese of course.
You are comingo in October 2011 I think, right?
About guides, there arent any.
Not the "guides" we see in Ireland, USA, France, UK, etc...
Unfortunatly "modern" lure fish is a recent trend down here, I've been fishing with lures for about 5 (almost 6) years and consider myself one of the firsts.
Of course there's lots of guys who had done it before, but maybe less than 50 guys in a 10 million habbitant country.
Most of the "guiding" you'll find is to do some boat fishing with organic bait, or big game.
In my opinion Big Game in here most of times it's just a turist trap.
Of course there are big blue marlins and BFT, dorados, etc, but most of the boats that will take you will charge you a hoarde of money and you'll be lucky if you'll catch some atlantic bonitos, and that with a massive big game tackle sucks IMO.
There is a recent company that started in Milfontes (Alentejo Coast) called "Bom Pesqueiro" that is speciallizing in jigging and soft baiting from boat targeting seabass, amberjacks, groupers, etc..
And they are doing a fantastic work IMO.
If you are interested, I can try to give you their contact.
Now if you are in for shore fishing for seabass, we have some excellent spots in all of our coast.
IMO the best zone in the country is SW Alentejo and part of Algarve that is facing West to the Atlantic.
The Algarve that is facing South can and has produce big fish, but it's not as easy fish, and as poor marks compared to the rest I've mentioned.
I live 30 km's from Sesimbra, and it's shore fishing it's not that great in the area that is turned South.
But, a little bit to the North of Sesimbra there are pretty good rocky marks that is were I fish normally 3 times a week.
They are not easy too walk, and you'll be fishing into some decent surf and swell, but sometimes they produce some good lunkers.
In this region there is also some good beaches with mixed groud (rock and sand) that are very good for seabassing.
I live in Barreiro, which is on the other side of the Tagus river, near Lisbon.
If you come to the Lisbon area, or Setúbal, Sesimbra, etc, I can go fish with you if you want, still I can't promisse any fish
Still, If you wanna go to the best I'll happly send you some marks in Google Earth for Alentejo the good part of Algarve.
Try to google this: Almograve, Odeceixe, Zambujeira do Mar, Sagres, Guincho, Ericeira, Praia de São Julião, Praia da Cordoama...there are lots more, but this will give you some general ideas of the fishing spots we really like.
About the estuaries, I don't know about the Douro (up North), but as for the Tejo (Tagus) and Sado, they hold some pretty nice sized seabass (my P.B was caught there, 6 kilo) and in October, if the weather is still warm maybe you can get a tug of war with a meagre (they go up to 70 kilo, I caught a 40 kilo one, of course all on sofbaits eheh).
If you have any questions don't hesitate.
Cheers from Portugal