• Free Service - What a great price! You can submit your links through this tool absolutely free.
• Browser Compatibilities - Although they recommend using firefox, the service is compatible with all major web browsers.
• Bookmarklet - They have designed a simple bookmarklet that you can drag and drop into your bookmarks' toolbar. The bookmarklet automatically fills in the URL and the title of the page. All you have to do is select the text you want used as the description. Once you have highlighted some text, just click the bookmarklet and it loads the Social Marker web page with the submission forms pre-filled.
• 47 Site Submissions - The service is compatible with 47 of the biggest social bookmarking services available like Digg, Slashdot, Reddit, StumbleUpon, and Del.icio.us to name a few.
• WordPress Plugin - They have developed a wordpress plugin that enables you to add their service links to your posts to help spread the word about your posts directly from your blog.
• Javascript Button - For those of you who don't use wordpress, you can use their pure javascript version of the wordpress plugin that enables you to post the link on any page on any site with just a couple lines of javascript.
• Easy Interface - Their interface for submitting your link to all the different sites is very easy and intuitive. They have designed a form that automatically fills in most of the fields and harnesses drag & drop capabilities for the rest.

This website is definitely worth watching. There is a lot of potential for it. They are also looking for developers to help them continue in the development of the service. You can visit the website at www.socialmarker.com for more details.

Caveat: You have to have an account for each website you are attempting to submit to.

Who doesn't like a helpful cheat sheet to have around? They save so much time and really help you learn what you are working with in an easy to understand format. I have gathered a list of the cheat sheets I have found to be the most helpful. There are cheat sheets from PHP to CSS to RegEx, and I have listed over 40 different cheat sheets to help!

• Design
  • HTML (1) (2) (3)
  • CSS (1) (2) (3)
  • XML (1) (2) (3)
  • RGB Hex Color (1)
  • DOCTYPE (1)

• Programming
  • PHP (1) (2) (3)
  • ASP (1) (2)
  • JavaScript (1) (2)
  • Ruby On Rails (1) (2) (3) (4)
  • Perl/CGI (1) (2)
  • Ajax (1) (2) (3)

• Database
  • MySQL (1) (2)
  • PostgreSQL (1) (2)
  • SQL Server (1)
  • Oracle (1) (2)

• Other
  • Regular Expressions (1) (2) (3)
  • mod_rewrite (1)
  • htaccess (1)
  • RSS (1)
  • WordPress (1)
  • CHMOD (1)
  • Vi (1)
  • Social Bookmark Links (1)
  • SEO (1)

For even more resources check out this blog post on the Virtual Hosting Blog.

Update

Hey everyone. DZone also has some great cheat sheets. They have one of the best layouts available. They have topics ranging from ajax to Eclipse. You can check them out here.

What cheat sheets did I miss? Leave any missing cheat sheets you found helpful in the comments.