So here is the long-waited photographic and video account of Election Day 2009, Santa Tecla.
Before I get into a narrative, here's a breakdown of the terms I will use:
Voting table: actually consists of a table staffed by 4 people, the ballot box, and a cardboard booth, the anaquel; there is also a Padron de Exhibicion nearby, which has the names of everyone who votes at that table
DUI card: the national ID card. everyone who votes needs one, and the entire adult population is eligible for one automatically
People at the table: There are four of them: the president, secretary, Primer Vocal, and Segundo Vocal. There are two from each party, and they can't wear party colors.
The President: checks people in and stamps their name on a list, inspects DUIS, and checks fingers for ink (see below); Sits second from the left
Secretary: signs and stamps the ballots; rips off the perforated corner of the ballot and gives voters a crayon - the person then votes
Primer Vocal: rightmost person; gets the crayon back; asks the voter to sign his/her name on yet another list of voters (or stamp if they can't write)
Segundo Vocal: degreases the thumb of the voter so there is no dirt on it, gives them a piece of toilet paper to wipe it off, and then makes the person dip their thumb in indelible ink
Vigilantes, Supervisor, and the Jefes de Centro: there are a certain amount of each of them from each party. I listed them in order of authority. Vigilantes are concerned with assisting voters, but they also watch out for corruption or suspicious activity, especially by members of the opposite party. Supervisors and the Jefe also do the same. They are decked out in obnoxiously obvious party gear.
Legal Representatives and Human Rights Ombusdmen: they are more directly involved in preventing corruption. and making sure people can vote
JEM: Junta Electoral Municipal, the local elections authority.
JED: the departmental elections authority
Now that that's done, here's a little summary of what I did. I won't put specifics as to violations and things like that because of legal reasons, but ask me personally if you want to no more about something. This is somewhat copied from my journal that day, hence the style of writing.
05:20 We arrive at the city of Santa Tecla. Four of us from CIS go into this one big school (whose name I am currently forgetting). The other two are in a second school. I randomly pick a table to observe very closely throughout the day, though I will also walk around.
06:30ish: My table is very efficient and very friendly. I introduce myself and explain that I don't speak Spanish well. This sometimes becomes an issue throughout the day, but I understand enough to do my job well.
10:00ish: Avila, one of the candidates, votes at the table behind me. The press goes crazy. He is surrounded by a huge posse of people.
That's the side of his bald head in the picture, which is all I ever saw of him.

10:30 I eat breakfast.
11:30 We're back in the voting center. This is the busiest time of day for voting, as the following picture shows. The building on the right is one voting center. Behind the trees on the left is another. Down the street and around the corner is the third. I am standing on a pedestrian bridge, the right end of which is a street that is the fourth voting area. The tents are various vendors selling all sorts of greasy foods and cold beverages. It's like a carnival without the rides.

During the afternoon, I went to the other two voting areas. The one in the street was very compact. Basically, it was a row of tents all behind this one:

People were basically walking on the sidewalk until they found their voting station and then walked in. The legal representatives' tent is the one with the green roof off to the right.

This is part of the voting area in another school. You can see a voting booth on the left and a side vew of the tables.

Below, I narrate the close of voting. The last hour was relatively uneventful and calm, so I was getting bored at this point.
I took more notes of the ballot counting that I did of any other point in the process, so I'm going to elaborate on almost none of that here. However, I will say that my voting table remained in very good spirits, even as the votes were being counted. In fact, they got yelled at by a supervisor for being too loud. Of course, everything got loud in due time. As each table finished, the vigilantes from each party that one the table would give a little cheer. Eventually, as the other 76 tables finished counting, the cheering collected to one big mass of yelling people as they waited in line with the results and ballots to be check in by the JEM.