Malware Analysis Blogs

[SysAdMini]

Another spanish blog : http://blog.segu-info.com.ar/

[Evilcry]

Hi,

my second blog: http://evilcodecave.blogspot.com

Regards,
Giuseppe 'Evilcry' Bonfa'

[RS-232]

Avast!'s Blog
http://blog.avast.com/

Threat Center Live Blog
http://threatcenter.blogspot.com/

[SysAdMini]

xchg.info
http://xchg.info

there is an article "Build your own Malware Sample DB" using MDL
http://xchg.info/?p=353

and maybe sowhat-x can explain him how does the Fast Entropy works on PEiD. 
http://xchg.info/?p=323

[RS-232]

Lol,i wouldn't really know that - i'm just the packers' collecting guy,making signatures and such - nothing more or less...  
Yet though - on the topic of python code/entropy calculation etc,someone might wanna check Roberto Perdisci's pages:
http://roberto.perdisci.com/publications/publication-files/Perdisci_Lanzi_Lee-PRL08-public.pdf
http://roberto.perdisci.com/projects/cpexe

//Edit//
...here's some c++ code as well for studying:
http://gynvael.coldwind.pl/?id=158
http://gynvael.coldwind.pl/?id=162

[RS-232]

Blast's Security Lab
http://www.sacour.cn/
Plus... (change date according to your needs,following are merely latest days' examples...):
http://www.sacour.cn/list/2009922.htm
http://www.sacour.cn/list/2009921.htm
etc etc...

[RS-232]

Securelist
http://www.securelist.com/ru/analysis
http://www.securelist.com/ru/weblog
From Kaspesky AV (use Google Translate or similar services):
quite a lot more articles than the english-speaking equilevant of Viruslist.com...

[RS-232]

EP_X0FF's Blog
From the author of Rootkit Unhooker,hosted over at rootkit.com:
http://rootkit.com/blog.php?user=DiabloNova

[john_]

Infos and some malware analysis :

http://cleanbytes.net

[ahelpyguy]

http://research.zscaler.com/