My name is Camilo, I live in Brazil and here TestLink is an very popular tool.
Recently, I did an new Implementation in the Test Report to show the Test Evidences and shared it at my blog.
In resume, it is an implementation to show the test evidênce if it is an image or the link to download if isn't an image. The Test Evidences are all the attachments include in the last test execution.
If any one of you are interested, I publish it in portuguese, but I am ready to talk in englis to help you with some problem of this issue.
The link to the implementation is:
http://www.camiloribeiro.com/blog/?p=427
Ps: Sorry for the english, I'm still studying.

Thanks and regards,
Camilo Ribeiro