I have a site in Spanish that is hosted in Spain with a .es TLD.

I already have many Spanish-language links from websites in Spain, but I obviously want more and I'm finding I might need to look beyond typical Spanish sites.

In talking to some of my link builders who work on my English/American sites, they are recommending that I build links on the normal article sites, blogs and web 2.0 sites that I normally build links on but that I make all the content English and insert the anchor text in Spanish.

For example, if my site were about "weightloss", my keyword would be "perder peso" (in spanish).  They are recommending that I have articles, reviews, etc written about weightloss in English with the anchor text "perder peso" worked into the English article.  Most of the sites are English sites that are hosted in the US (article sites, web 2.0 properties, etc).

My question is what is the value of these links?  Does anybody have any experience with this?