I don't know about blogs, but there is good doc on the wiki:

http://wiki.squeak.org/squeak/2665

Sebastian Sastre wrote:

>Hi Goran,
>
>	there is any blogpost to read an experience about using magma that
>you know?
>
>	thanks,
>
>Sebastian 
>
>-----Mensaje original-----
>De: squeak-dev-bounces at lists.squeakfoundation.org
>[mailto:squeak-dev-bounces at lists.squeakfoundation.org] En nombre de
>goran at krampe.se
>Enviado el: Martes, 23 de Enero de 2007 06:28
>Para: The general-purpose Squeak developers list
>Asunto: RE: Load OmniBase in Squeak
>
>Hi!
>
>"Sebastian Sastre" <ssastre at seaswork.com> wrote:
>  
>
>> OK, I'll give it a chance. I'll read some tutorials first. 
>>Any introductory (to glorp) reads references you want to give me are 
>>welcome.
>>    
>>
>
>Btw, Magma works really good. We use it with great success in Gjallar.
>That doesn't mean GLORP isn't good too (though I haven't used it yet) - but
>IMHO we *do* have a good ODB today and that is Magma.
>
>regards, Göran
>
>
>
>  
>