there's an online free resource for language learning thing that a friend pointed me to here
http://fsi-language-courses.org/Content.php
I must confess I've not really tried to use it, as it doesn't do Dutch or Welsh.
I think the main thing would be trying to get as much practice as you can, download spanish radio podcasts, or have a look at spanish newspapers, finding someone to try and speak with will probably help a lot too.
I believe Mr Thumbs is quite into Spanish, or at least his wife is (he may of course just keep her chained to a cooker and communicate mostly via grunting. this is pure speculation, and quite probably bears no realtion to reality :incheek
edit: i should really try to type a bit quicker.