Well in terms of SEO it's fantastic, according to Google adwords keyword tool there are 110,000 global monthly searches for "visa permits" so for an immigration blog or visa law blog/information wesite for adsense it could work really well (that's what I've been doing with it so far, it's creeping up the rankings slowly).
Alternatively an immigration consultancy company such as globalvisas.com. Advice on which visa permit to apply for and help on how to apply is big business, which is only going to expand as globalization continues.