One of the reasons I went to Guatemala was to get some first-hand experience with what things are like in part of the Global South. One thing that was a little surprising was how widespread and affordable internet access was.
The bigger cities had many, many internet cafes. As many as three a block in a few stretches of Xela. There was a pretty wide variety - some were very slick, had fast connections, new computers, and decent food and coffee; others had a pile of decrepit machines on card tables. The latter also tended to feature US keyboards but Spanish keymappings - good luck with that. The nicer ones all had Spanish keyboards, which is a bit different for the out-of-towner but is at least manageable.

Even out-of-the-way places like Livingston had multiple opportunities to surf the web for about a dollar an hour. This isn’t very surprising when you consider that Livingston gets a large number of tourists, but on the other hand, you can’t even get there by road, so it is pretty remote and there doesn’t seem to be a huge amount of money flowing into the community. My access in Livingston was definitely the funkiest of the bunch - I ended up on a machine running NT 4.0 with IE 4, which fortunately is still capable of pulling firefox down from http://mozilla.com. My hotel in Tikal had a couple computers with a satellite connection, not bad for a place that didn’t even have electricity available around the clock.
As for internet access in people’s homes, it’s definitely out there. My Spanish teacher had a dialup connection at home, which he relied on for communicating with family in the US. There were plenty of ads for cable modems around town, but the rates are out of the question for any but the wealthy (unlike cable TV, which is super cheap compared to what they charge in the US). Plenty of families seemed to have computers in their homes without even dialup, which makes sense given the economics of broadband access there; I’d certainly rather spend $0.50 to do my internet business on a decent machine with a good connection in a cybercafe, if the only other affordable option was dialup.