1) Blogger.com is a good one,
2) Livejournal.com is popular,
3) Everyone on Myspace.com can have links to their last few blogs appear on their page, and
4) As in the previous answer, Yahoo 360 is another option.
References :
Personal experience

Free Word Press blog.
http://wordpress.com/

Word Press rocks.

Michael
http://www.webmasterautomation.com/blog/
References :

Blogger,
LiveJournal,
Xanga,
Typepad

these are some free blog hosts with template and design tools and money making opportunities too,

check my profile for more information, all the best
References :

there are two things:
1) one is traffic
1) second is quality traffic

am talking about a website which has a 500 arround alexa traffic rank, and about 6/10 google's page rank.

get a free back link from this site, get a lot of free traffic, in this site you get free credits, and with that you get free traffic.

everything is free, http://www.trafficswarm.com/go.cgi?537476
just get some easy traffic, also first 50 credits will activate you account, and then you will get your 100 free credits, then on you get free credits, with that you get free traffic.
References :

Here's another vote for Wordpress.

It's got so many cool features and plugins. Once you get the hang of blogging, you should look into moving your blog onto a cheap hosting account. You'll have a lot more flexibility in what you can do if you host it yourself.
References :
Increase traffic and boost PR in minutes. Auto-submit to 275+ quality directories at once:

http://www.lazyseo.com