Build Social Applications with the Force.com Toolkit for Facebook
@metadaddy
A third release of Force.com Toolkit for Facebook, now allowing you to write a social application for Facebook in Apex Code and deploy it as Force.com Site, a customer portal, or a VisualForce page running in an org.

Format Salesforce Data Time Fields in Excel
@sfunearthed
Different ways to format Salesforce DateTime fields in Excel.

Multi File Uploader for Salesforce
@TehNrd
Upload multiple files to Salesforce at one time with the first release of Multi File Uploader Tool.

New and Updated Developer Documentation for Spring ’12
@forcedotcom
Developer documentation on developer.salesforce.com and database.com are now updated to reflect the new Spring ’12 Salesforce release.

Monday AM Admin: Get your Chatter-cation
@MikeGerholdt
Get your organization more excited about using Chatter with these insights and suggestions.

Force.com Streaming API and Chrome Desktop Notifications
@abhinavguptas
How to set up PushTopics and get real-time chrome desktop notifications.

REST API Cheat Sheet: It’s Only Cheating if You’re Taking a Test
@forcedotcom
Force.com added a REST API cheat sheet to their library of cheat sheets.

Tip: Using Decimal Class with Strings in Apex
@abhinavguptas
Try storing your queried number field as a specific Type(Decimal) in a local variable, which will save you from any accidental code API version upgrade from breaking the existing code.

Sinatra, Force.com and Heroku- In Perfect Harmony
@metadaddy
A cookbook recipe that shows how to call the REST API from a Ruby Sinatra app.

Advanced Reporting and Dashboards in Salesforce: Google Visualization with Visualforce
@sfunearthed
Get started with Google Visualization API’s.

Salesforce: JavaScript Remoting- A Different Way of Thinking
@wesnolte
A few examples of how JavaScript remoting differs from “normal” Apex and Visualforce.

Create Custom Objects and Fields with Spring ’12 Schema Builder
@metadaddy
Video outlining the new features in Schema Builder Spring ’12.

Mobile SDK Webinar Recording and Code
@cloudysan
The Mobile SDK webinar is now available for viewing; learn about the current mobile landscape, their strategy going forward, and how to use Mobile SDK to develop really awesome mobile apps.

APEX Trigger to Prevent Duplicate Object Records
@SalesforceGirl
Duplicate records and contacts is a huge Salesforce no-no, use this trigger to prevent them.

Detecting the sObject Type of Id’s from Ambiguous Fields
@SalesforceGirl
How to accurately check if you are dealing with a User or a Group sObject in the OwnerId field.

Ding! Ding! Round 2!
@sfdc_nerd
Becka launched Chatter in her organization by first testing it in a sandbox environment for two months, then officially launching it over a weekend.

Salesforce Email Services- Where is “Delete” Button?
@abhinavguptas
What to do if Delete button is not coming on configured Email Services.

Video- Getting Started with Rails & Database.com Gem
@jeffdonthemic
Since salesforce.com bought Heroku last year, it might be a good idea to start learning ruby. Here’s a video to help you get started.

Upload Contacts from CSV File in a Visualforce Page- Source: Ranjeet Singh
@sfunearthed
A sample code that lets you upload contacts from a Visualforce Page using a CSV file.

Developer Contest Contests!
@sbob909
New developer contest, “Mobile Hybrid;” submit an article that demonstrates how to build a web application using the Mobile SDK hybrid approach.

Fricandy
@cloudcoder
A few suggestions on how to use HTML5/CSS3 to visualize your Salesforce data differently.

Social Single Sign-On- Authentication Providers in Spring ’12
@metadaddy
How to use external authentication providers such as Facebook to access Salesforce portals and orgs.

Big or Small, You’ll Love the Social Fleet- Salesforce of Things
@ReidCarlberg
A video on The Social Fleet, an application that helps you monitor and manage your fleet using the Force.com platform.

Video and Slides for Spring ’12 Webinar Available
@joshbirk
The Spring ’12 developer webinar is now available for viewing.

Forcing Opportunity Creating During the Lead Conversion Trigger
@_siddhesh
A trigger that throws an error message if the Create Opportunity check-box is not checked.

Multiselect Picklist Jquery Plugin for iPad and Desktop Browsers
@abhinavguptas
How to develop a multi-row and multiselect picklist that looks similar in both a desktop and iPad browser.

Integrating Google Maps in Salesforce
@forceguru
How to show the location of your Account in Google Maps within Salesforce.

SOQL Offset in Spring ’12
@cloudysan
“OFFSET” clause in Spring ’12 allows you to paginate through your result set directly in SOQL.

Resolved: “Field is not writeable: Sobject_Share.RowCause”
@abhinavguptas
How to fix a problem that comes with Apex managed sharing.