Versus Versus

ext2 vs ext3
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The main difference is that ext3 is a journaling file system. ie, they logs changes to a journal (usually a circular log in a dedicated area) before committing them to the main file system.

Dynamic URLs vs Static URLs
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Websites that utilize databases which can insert content into a webpage by way of a dynamic script like PHP or JavaScript are increasingly popular. This type of site is considered dynamic. Many websites choose dynamic content over static content. This is because if a website has thousands of products or pages, writing or updating each static by hand is a monumental task.

There are two types of URLs: dynamic and static. A dynamic URL is a page address that results from the search of a database-driven web site or the URL of a web site that runs a script. In contrast to static URLs, in which the contents of the web page stay the same unless the changes are hard-coded into the HTML, dynamic URLs are generated from specific queries to a site's database. The dynamic page is basically only a template in which to display the results of the database query. Instead of changing information in the HTML code, the data is changed in the database.

ref: http://www.webconfs.com/dynamic-urls-vs-static-urls-article-3.php

LILO vs GRUB

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Both are linux boot loaders. LILO is little outdated than GRUB. Now most of the linux distribution uses GRUB boot loader. Another important advantages are

• GRUB has a more powerful, interactive command line interface. LILO, on the other hand, only allows one command with arguments.
  
  
  
• LILO stores information about the location of the kernel or other operating system on the Master Boot Record (MBR). Every time a new operating system or kernel is added to the system, the Stage 1 LILO bootloader has to be manually overwritten, otherwise there is no way to boot the new OS or kernel. This method is more risky than the method used by GRUB because a mis-configured LILO configuration file may leave the system unbootable (a popular way to fix this problem is to boot from Knoppix or another live CD, chroot into the partition with mis-configured lilo.conf and correct the problem). On the other hand, correcting a mis-configured GRUB is comparatively simple as GRUB will default to its command line interface where the user can boot the system manually. This flexibility is probably the main reason why many users nowadays prefer GRUB over LILO.
  
  
  
• Unlike LILO, GRUB has a web site. It also has a manual, FAQ, a bug tracker, a developer mailing list and a logo. LILO has none of those.

ref: http://lwn.net/Articles/89772/