View all tasks across all site collections

This is a great approach to pull all tasks from all site collections and display in one spot…

http://kjellsj.blogspot.com/2010/08/my-tasks-web-part-search-driven-cross.html

InfoPath using WebService

Good example of hitting the UserProfileService via a web service from InfoPath…

http://blogs.microsoft.co.il/blogs/itaysk/archive/2007/04/05/InfoPath-_2D00_-Get-the-current-user-without-writing-code.aspx

Browser Enabled InfoPath Forms

Before you start down the path of building a browser enabled InfoPath form, review this…

 http://office.microsoft.com/en-gb/infopath-help/infopath-2010-features-unavailable-in-web-browser-forms-HA101732796.aspx

User Profile Setup – Step by Step

If you need a detailed step by step guide to setting up user profile snchronization, here it is…

http://www.harbar.net/articles/sp2010ups.aspx

Custom Web Part that sends an email

Here’s a link to a custom web part that shows how to send an email using SharePoint’s SPUtility.SendEmail() function.

http://www.codeproject.com/KB/sharepoint/SharepointContactForm.aspx

Start Building your own Web Parts.

This is a good example of a simple custom web part. It has the basic code to get your head wrapped around the process…

http://www.fivenumber.com/custom-webpart-inserts-items-into-sharepoint-custom-list/

This link gives you the how-to around deploying your custom web part…

http://msdn.microsoft.com/en-us/library/ms415817(v=office.14).aspx