Asgvis offers a nice video tutorial.

This tutorial will show you how to use HDRI images (High Dynamic Range Images) to make realistic lighting.
Read more…
Rhino 4.0 Service Release 5
What’s New, SR5
Enhanced Features:
- RecordAnimation: RenderFull method can now be canceled with the Esc key.
- RoundHole: The Radius option now gets the keyboard input by default.
Bug Fixes:
- ArrayPolar: Input angle sometimes overshot. This is fixed.
- Crash reading dwg file.
- Crashes fixed:
- Revolve - A crash when revolving a closed curve has been fixed.
- ExtrudeSrfTapered: Surfaces made by the PlanarSrf command may not work properly when they are used as the input surface for this command. This is fixed.
- MoveCrv: History did not workproperly with the MoveCrv command. This is fixed.
- Open:SolidWorks: Assembly files were read as empty. This is fixed.
- PointCloud: When points were deleted from the pointcloud, the pointcloud’s bounding box did not update. This is fixed.
- Print: A problem printing to Adobe PDF files has been fixed.
- Project: Projecting a line to a planar surface incorrectly created a cubic line instead of a line. It now creates either a line or a degree 2 single span NURBS curve.
- Revolve: A failure bug when revolving closed polylines has been fixed.
- RhinoScript: Cancelling a script could leave objects highlighted even though they were no longer selected. This is fixed.
- Save:DWG/DXF: Multi-line text exported with wrong vertical position. This is fixed.
- Save:STEP: A problem exporting planar surfaces has been fixed.
- Save:STEP: A failure bug exporting to UG and SolidWorks has been fixed.
- SmartTrack: Did not always snap to all ortho directions from the smart point. This is fixed.
- Sweep2: Canceling an AddSlash operation caused the rails to become unslectable for another AddSlash operation. This is fixed.
- UnrollSrf: A failure bug was fixed.
- UnrollSrf: The border of an unrolled surface could not be joined. This is fixed.
- WebBrowser: The command makes an attempt to open the desired page in a new tab or window.
1. Official Site (Download)
2. Rapidshare (Download)
Rhino basic tutorials
Intro: what is nurbs?General modeling tips.Analyzing Shape.
Rhino Interface&Settings
Intro: Interface and Settings in Rhinoceros
Mouse tutorial
Intro: Modeling a computer mouse in Rhino
Hood tutorial
Intro: Modeling a hood in Rhino
more information…

Grasshopper 0.5.0050 is now available for download from:
http://download.rhino3d.com/download_rel.asp?rel=400
This is quite a major new release (it’s been 3 months after all) which undoubtedly has many fresh bugs.
For more information
Based on the Brazil r/s 2.0 technology, Rhino users can now use the same rendering technology as the world’s most demanding CG artists without leaving Rhino.
Brazil r/s for Rhino is still in development. All Rhino 4.0 users are invited to fill out an application. (You will get an e-mail invitation to join the beta via e-mail in a few days.)
For more information, visit� Brazil r/s 2.0 for Rhino.
Worth mentioning is that I like the tagline on the website.�
‘The timid need not apply…‘