Hi Casinotime,
Based on our current in-house stats as well as other industry studies, the Spanish market is one with definite potential. Like in any market there are both good and bad out there, but we are definitely turning up the focus on the Spanish (both euro and South/Central America) as well. We are bringing out a version of one of our websites in Spanish in the coming weeks, have already got the software as well as splash pages and banners. We offer Spanish support and have a full time translator onsite. So from our perspective a definite market 
.
As a side note with languages and other markets – when entering a market in another language it’s important to make sure the people you work with on translations, creatives etc are people who understand the industry and the game. Makes for better conversions and in turn more $$ at the end of the day.
Cheers,
Yaniv