Sharepoint Branding tools for Themes, MasterPages and Stylesheets

http://www.codeplex.com/BrandingTool

Sharepoint Webpart using WebUserControl of asp.net

http://www.codeproject.com/KB/sharepoint/WebParticles.aspx?fid=400774&df=90&mpp=25&noise=3&sort=Position&view=Quick&fr=26

Visual Studio 2005 extensions for .NET Framework 3.0 (Windows Workflow Foundation)

http://www.microsoft.com/downloads/details.aspx?FamilyId=5D61409E-1FA3-48CF-8023-E8F38E709BA6&displaylang=en

 

Required to develop custom workflows and custom activities

Windows sharepoint services extensions for Visual Studio 2008

http://www.microsoft.com/downloads/details.aspx?FamilyID=7bf65b28-06e2-4e87-9bad-086e32185e68&DisplayLang=en

It is required to develop custom webpart or any other custom sharepoint stuff.

A good link :

http://www.mediablend.co.uk/blog/CategoryView,category,SharePoint2007WebParts.aspx

Caching in Sharepoint (Moss2007, WSS3.0)

http://www.sharepointblogs.com/bobbyhabib/archive/2008/07/02/different-type-of-moss-caching-mechanisms.aspx

https://blogs.msdn.com/nehajain/archive/2009/05/25/how-to-automatically-reset-clear-the-blob-cache-disk-cache-programmatically.aspx

http://msdn.microsoft.com/en-us/library/aa604896.aspx