VirtualizeTips.com is a very interesting blogsite on servervirtualization. The main focus is on VMware solutions and vSphere specifically. You will find info on HP Blade technology as well.
In February 2011 the authors of the site published the first issue of an electronic magazine. Initially the focus of the magazine will be heavily focused around VMware technology but as time passes the authors hope to be able to incorporate other Virtualization topics into the mix. The content will include interviews, how-to articles, reviews and community based topics.
The February edition has articles that cover HP BladeSystem Matrix, Designing with VAAI, new VMware certifications, storage and networking articles and Kendrick Colemans home lab and several other topics.
You can download the Magazine in PDF Here or Here.