1. Diigo

Diigo provides a browser add-on that can really improve your research productivity. As you read on the web, instead of just bookmarking, you can highlight portions of web pages that are of particular interest to you. You can also attach sticky notes to specific parts of web pages. Unlike most other web “highlighters” that merely clip, Diigo highlights and sticky notes are persistent in the sense that whenever you return to the original web page, you will see your highlights and sticky notes superimposed on the original page, just what you would expect if you highlighted or wrote on a book!

Moreover, all the information — highlighted paragraphs, sticky notes, and the original url — are saved on Diigo servers, creating your personal digest of the web, your own collection of highlights from the web – ones that are meaningful to you! You can easily search, access, sort and share this collection from any PC or even iPhone.

2. Delicious

Delicious is a bookmarking service that is being provided by Yahoo! Inc.

This is my favorite bookmarking service that I am using almost everyday, almost every time when I’m writing some article.

3. Mister Wong

Mister Wong is bookmarking service where you can:

• search and find the best sites on the web
• save and manage your favorite websites
• access your online account wherever you are
• connect with twitter and automatically import interesting links

4. Simply

Simpy is a social bookmarking service. With Simpy, you can save, tag and search your own bookmarks and notes or browse and search other users’ links and tags. You can be open and share your links with others, or keep them private.

Simpy also helps you find like-minded people, discover new and interesting sites, publish your bookmarks, detect and eliminate link-rot, etc.

• Simpy is 100% FREE!
• Registered users see NO ADVERTISEMENTS!
• Access your bookmarks from any computer and any browser – home, work, school…
• Save and Tag pages with a single click via a bookmarklet or browser extension (Firefox)
• Choose between private or public (shared) bookmarks
• Full-text Search bookmarked pages” content, not just meta-data
• Attach searchable notes to bookmarks
• Create private or public Groups, invite others, collaborate
• Find people like you and subscribe to their bookmarks
• Share your bookmarks with others
• Detect broken, forgotten and even redirected bookmarks
• Upload your existing bookmarks (Firefox, Mozilla, Netscape, Internet Explorer, Safari, Opera, Galeon and Konqueror supported); Sync with del.icio.us; Export your bookmarks
• Save private, taggable, and searchable free-text Notes
• For hackers: Simpy has an open REST API – use it!
• For bloggers: Publish your bookmarks in your blog using RSS

Digg-Like sites

1. DesignBump

DesignBump is a very useful site for design related bloggers to get traffic. Bloggers post links and make them popular.

2. Digg

Digg is a place for people to discover and share content from anywhere on the web. From the biggest online destinations to the most obscure blog, Digg surfaces the best stuff as voted on by our users. You won’t find editors at Digg — they are here to provide a place where people can collectively determine the value of content and they are changing the way people consume information online.

3. DesignFloat

Very similar site to Digg, but the only difference is that this page is only about design. It says “Welcome to DesignFloat.com the number one design related stories sharing resource”.

4. Sphinn

Sphinn is a social site for search and interactive marketers. It’s designed to allow you to share and discover news stories, read and take part in discussions, discover events of interest and network with others.

5. Pixel Groovy

It says “Pixel Groovy is a user controlled tutorial directory. We provide the members with the control, not editors, to decide which tutorials are worthy of being published and which tutorials aren’t. This helps filter out and set a level of quality in the tutorials seen on the frontpage”.

6. Dig A List

DigaList helps you dig out your lists to share, cobuild with friends (or thousands people) or Discover awesome lists.

7. CSS Globe

Css Globe is a community news site where members can publish news about web standards, css, web design and web development.

8. DZone

DZone is a technology publishing company that produces valuable content for software architects and developers worldwide.

9. … and a lot of other sites you are able to see here