Reddit mentions of Dutch: A Comprehensive Grammar (Routledge Comprehensive Grammars)

Firstly, this torrent has a ton of things to help you learn Dutch. I own a hard copy of a grammar book, Dutch: A Comprehensive Grammar. It's very good. There's some workbooks in the torrent but I haven't really looked at them. There's also some kids books with their audio versions included.
For vocabulary I use memrise mainly, but there's also some flashcard sites: dutch flashcards, anki. A good grammar site is this. Here's a podcast to help you learn Dutch. And here's some other sites: http://www.2bdutch.nl/, http://www.lingq.com, more resources, more resources, Mango (I used this when I was a beginner because I got it free through my school. You might be able to get it free through your library), lang8, and that's all I've got. Should be enough :p Good luck!

Forget software! That's only helpful for a first few words (A1).

For anything higher, you'd want to get a good grammar book (like this one and a language learning book. I used 'Taal Vitaal', but that's for German-speakers, which mean I can't really recommend one for English-speakers.

Maybe you can even do a language course. I always found them to be too slow for me, so I stopped and learned the language using books.

Good luck and have fun!

P.S.: If you're planning on working in the Netherlands, learning Dutch is probably one of the best things you can do. As you've probably seen in the two years you were in Utrecht, you can come by with English only, but you never get to dive in and not be regarded as a foreigner.

Also having a native-speaker around you to practice with helps a lot.