If you take a look at the Gmail Help Forum you will notice dozens of threads with hundreds of posts about Google's spam filter failing in a major way. In addition, you can see hundreds of tweets about the issue this morning as well.
I cannot summarize all the thread, but here are the largest ones in that forum:
- Why is so much spam passing through lately?
- SPAM in GMAIL getting ridiculous
- Eggs, bacon, and SPAM!
- Dear Gmail, WUDDAFUXUP with the spam today? Higher con-spam-ination content than normal...
One of my Gmail accounts suffered from spam about a month ago, but it seems to be getting better now - or maybe I am used to the new spam.
It seems like something spiked up bad today, based on the volume of posts over the weekend.
No official word from Google on the topic yet. Hat tip to Gabs for encouraging me to write about this.

Comments:
No Name
06/01/2009 02:41 pm
There is also a host of complaints about gmail spam on Reddit. I'd really like to see an analysis of the new methods that get spam through Gmail. It's like a continuing war but one side just effectively changed their tactics and we are blind to how it changed.
nick
06/01/2009 05:55 pm
the entire front page of the gmail help forum is flooded but as far as i can see no reply from google. i can probably count on my hands how many spam messages have gotten through in my almost 5 years as a gmail user... i've been getting a ridiculous amount since Friday or so.
HI
11/19/2009 07:11 pm
Yes, my email yabdulhak@gmail.com is messed up too and the spam filter doesnt work.
Barbara Alice
09/10/2011 01:57 am
Yes I have noticed that there is much more spam coming through - and I don't like it. That was one of my reasons for switching to gmail cus there was little spam but now it's a bit overwhelming
Beautybyus_
11/24/2011 09:39 am
You want to know the biggest irony here? Google itself is one of the largest global sources of spam! They have lost control.