Just wanted to let you know that if you fancy a trip to Swaziland on your way to Moz you don't have to pay a fortune for Mozambican visas. The Mozambican consulate charges ZAR 80 for a single entry visa & they are ready by lunchtime on the day you apply (don't get there too late though). Ensure you have photos for the application if you don't have an old Mozambican visa in your passport.
The Mozambican consulate is just outside Mbabane (Mountain view exit on the old Mbabane - Manzini road just before you enter Mbabane). It's badly signposted but most backpackers in the Ezulwini valley can point you in the right direction