ReSharper 4.5.1 released and the first Nightly builds of ReSharper 5.0 for VS 2010

This is Maintenance release, which is a free update to the 4.x version.
List of changes
New "Short ReSharper demos"
Release itself

New feature
[RSRP-3236] - Inline rename does not react to invalid input
[RSRP-5474] - "Inline field ..." functionality
[RSRP-5481] - Encapsulate the field: Should check overrides / hides and warn
[RSRP-5902] - Provide Auto-complete / IntelliSense in dialog boxes.
[RSRP-6485] - Introduce Constant: make separate refactoring
[RSRP-20860] - Some symbols are not considered when searching for similar names
[RSRP-37222] - Suggest more names for out-parameters
[RSRP-37353] - new string variable name based on string value
[RSRP-38725] - To rename field in encapsulate refactoring
[RSRP-40115] - Move
[RSRP-41797] - Coding in Reverse: Inline Variable Type
[RSRP-60700] - Add "replace all instances" of lambda -> named method conversion
[RSRP-103607] - Introduce two extra groups of identifiers

JetBrains gave a link to Resharper 5 Preview for VS 2010 here:

(for 2010 thanks to XenJ )