IT

In the IT world google isn’t always the best, or at least the only place, to look for answers. Sites like “Stackoverflow.com”, “DevX.com” or even “Delicious.com” can, often, provide much faster, better and direct results.

Wikipedia has a (incomplete) list of developer communities. Some of the most valuable ones are discribed below:

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General Communities:

Stackoverflow.com

A great community and place to ask or look for IT resources.
Before posting a new question be sure to read the faq section first.
To purge your search results consult the search options. Two examples are:

• use [tag], ex. [Java] someOtherWords;
• use “” for phrases: “Java someOtherWords”;

The Code Project

articles for an audience of computer programmers. Articles can be related to general programming, GUI design, algorithms or collaboration. Most of the articles have been uploaded by visitors and have not been extracted from an external source.

SourceCodeOnline

a respository of multiple techonologies source code examples/projects.

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Java Communities

JavaRanch

One of the best Java Communities around. The forums are realy helpfull.

Java Community on Oracle

this official page has links to blogs, articles and other;

JavaWorld

an online technology website focused on Java technologies, founded in 1996. Since 2006, JavaWorld has become a subsidiary of Network World.
This is mainly a News Site.

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Microsoft Communities

CodeDigest.com

is a user contributed site, primarily concentrating on Microsoft .Net technology. Any of the registered user of the site can share their knowledge by writing articles and submitting on the site by following the guidelines provided by Codedigest.com. CodeDigest.Com has articles on:

• ASP;
• ASP.NET;
• Csharp;
• VB.Net;
• Directory service;
• Active Directory;
• IIS;
• Sharepoint;
• Microsoft SQL Server;
• etc.

Microsoft Developer Network

is the portion of Microsoft responsible for managing the firm's relationship with developers and testers.
It has many sites:

• MSDN Library is the centralized repository of official developer-related documentation. Document sets are published by various user assistance organizations within Microsoft, and the community has the opportunity on many of the pages to add their own annotations. Community Content contributions can be edited by anyone.
• MSDN Gallery:  is a repository of community-authored code samples and projects. New in 2008, the purpose of the site is still evolving to complement Codeplex, the open-source project hosting site from Microsoft.
• MSDN Forums: used by the community to discuss a wide variety of software development topics.

CodePlex

CodePlex is an open source project hosting website from Microsoft. It allows shared development of open source software. CodePlex is an open-source Website where engineers and computer scientists share projects and ideas.

Codeplex encompasses a wide variety of projects, including SQL, WPF and Windows Forms-related projects, major activities center around the .NET framework, including ASP.NET, and Microsoft's intranet collaboration server, SharePoint. The most prominent and used project that was born inside CodePlex, the AJAX Control Toolkit is a joint project between the community and Microsoft.