I've been experimenting with the dev version of Drupal 7 and was initially having problems with the PHP memory. This is the memory error that I was getting:
An error occurred.
http://d7tank.localhost/install.php?locale=en&profile=default&id=1&op=do
Fatal error: Allowed memory size of 16777216 bytes exhausted (tried to allocate 35 bytes) in /home/me/workspace/d7tank/includes/registry.inc on line 153
Here is the solution:
Open up your .htaccess file in the root of your Drupal installation and add this line to the top:
php_value memory_limit 64M
It will look like this:

There are other ways to increase the php memory limit, but the method mentioned above is the quickest.
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Comments
Increasing Drupal's PHP Memory Limit
You are correct in that there are multiple ways to change your PHP Memory Limit. I like to change my PHP settings in the /sites/default/settings.php file. There is a section in that file for PHP settings.
I like to drop in the following settings at the end of the list:
ini_set('max_execution_time', 60);
ini_set('max_input_time', 120);
ini_set('memory_limit', '32M');
Hi, May you tell me what
Hi,
May you tell me what modules you use to enable "Tags" for blogs?
Thanks in advance.
settings.php
@slingshoteric
Thanks, I didn't know that was in there. I'll try that next time.
@Hùng
To use blog tags, use the Taxonomy Module -- it's built in. Depending on what version of Drupal you're using it's either under "taxonomy" or "categories" in the menu. Make a new vocabulary called "Tags" and check the box that says "free tagging". Then enable that vocabulary for the blog content type. See also the taxonomy tutorial.