There are a lot of resources out there that help you to learn a new
language. I’d like to know what the most effective ones are.

I already use the CD-Rom’s from 

http://www.unforgettablelanguages.com/

and have started using the flashcard program called VTrain from

http://www.paul-raedle.de/vtrain/home.htm

but what else is there that actually delivers what it promises?

Berlitz (http://www.berlitz.com) has a really good reputation for
effective language courses (though I don't know how inexpensive they
are). I got a college minor in French, but have never taken one of
their courses, so I can't speak first-hand to their quality. However,
my older sister tried a high school language class briefly and gave it
up, having little proficiency for languages. Later she ended up as an
executive with a large US corporation, and has lived and worked in
London, Paris, Singapore, and Hong Kong. For that purpose, she has had
to learn French and two kinds of Chinese (I never would have believed
she could do it!), and the Berlitz "blitz" courses seemed to have
worked pretty well for her.

Hope this is a help to you!

The RosettaStone language learning CD-ROMs are great. I've used them
to learn Spanish.  I'm up to level 3 now.

http://www.rosettastone.com

I know this is the most expensive option but I have learned many
languages over the years (was also a language teacher) and there is no
better way than to actually learn the language in the country where it
is spoken.
e.g. for Spanish, you can try a course with Enforex
(http://www.enforex.com) - I took a course there a year ago and even
in a week saw my level of Spanish go up massively.

Hi,

I am a qualified Spanish teacher who teaches in a secondary school in
Liverpool, England.

I host an online course at:

http://acceleratedspanish.tripod.com

Martin Cosgrove, BA (Hons), PGCE