The quick use provides an import snippet such as:

@import url("http://fonts.googleapis.com/css?family=Yanone+Kaffeesatz:400,200,300,700&subset=latin,latin-ext");

That line should be included into the templates/style/less/o-blog-default.less file in which you should also add something like:

h1, h2, h3, h4, h5, h6 {
    font-family: "Yanone Kaffeesatz", sans-serif;
}

And that's it.

That is less efficient in terms of network resources but provide a good alternative for offline publications.

The script get-font does all needed jobs.

#!/bin/sh

if test -z "$1"; then
    echo "Usage: $0 font-url"
    exit 1
fi

FONT_DIR=templates/style/font
LESS_DIR=templates/style/less

FONT_URL="$1"
LESS_FILE=$(echo "$FONT_URL" | sed -n 's/.*family=\([^:]\+\).*/\1/p' | sed 's/+/-/g')

# Wee need to provide a valid user agent to get woff fonts
UA='User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.65 Safari/535.11'


CSS=$(curl -H "${UA}" ${FONT_URL})

echo "${CSS}" | sed -n "s#.*local('\([^']\+\)'), url('\([^']\+\)').*#curl -o ${FONT_DIR}/\1.woff \2#p" | sh -

echo "${CSS}" | sed  "s#\(.*\)local('\([^']\+\)'), url('\([^']\+\)')\(.*\)#\1local('\2'), url('../font/\2.woff')\4#"  > "${LESS_DIR}/font-${LESS_FILE}.less"

echo "You should add '@import \"font-${LESS_FILE}.less\";' to templates/style/less/o-blog-default.less"

You can run:

./get-font 'http://fonts.googleapis.com/css?family=Yanone+Kaffeesatz:400,200,300,700&subset=latin,latin-ext'

And add the font declaration in templates/style/less/o-blog-default.less:

@import "font-Yanone-Kaffeesatz.less";

Add declare its use like in the Google API version:

h1, h2, h3, h4, h5, h6 {
    font-family: "Yanone Kaffeesatz", sans-serif;
}