It's 11px Arial. This is certainly not a big font, but is commonly used in a lot of skins and from here I can see the same size on the other site pages as well, except the forum where 12px is used.

What I'm getting at is that you can change it for that one item, but you'll probably find you want to change it all over the place. Look to make such general changes in the skin.css file.

If you just want to work on the blog fonts, copy the contents of this file:http://www.mcmtc.ideosolutions.com/DesktopModules/Blog/module.css into your skin or portal.css and make changes to it there.

If you're only interested in that one style you've found, and you're not able to work on the server files, paste it into the stylesheet editor in Admin, Site Settings and give it a bigger px value:  .blog_Description{font-size:13px}

One tip: You really need to recompress that 528Kb mcmtc-splash.png file on the homepage.. it's huge. I'll do it for you if you have trouble.

Rob