Are iFrames too archaic to use in a modern site?

Hey guys,
I’m working on a robotics club site for school and it has to be on the school server, which doesn’t have php or sql or any real server side tools. I would like a CMS blog that can be managed by others and have elected to embed a tumblr. I know you can embed the script and format it with css, but for now this was easier and appears to work fairly well. I like to be as semantic as possible so iFrames don’t seem like the right solution. Anyone have ideas for a better way to embed a tumblr? site