B.
Technical and structural criteria such as layout and design features, navigational access, advertisements and links; interactive capabilities, and how well the e-zine uses these in terms of creating logos and ethos;

C.
Cultural studies issues such as identity and community formation; audience reception; ideologies and values the zine upholds; its relationship towards dominant culture in terms of how it resists or reinforces ideologies found in mainstream media.

Possible Zine Communities to Study 

Feminist

Writing Communities

Political 

Music Subcultures

Fanzines

Queer

The Links page provides not only individual sites to consider for your evaluation but zine databases and linksites PLUS some of my favorite zine distros where you can order print zines, participate in message boards, and find out all there is to know about zine production.