Vinod (2008) “Hands On Intermediate Econometrics Using R: Templates for Extending Dozens of Practical Examples.”  World Scientific Publishers: Hackensack, NJ (201) 487 9655 . Book is sold at the usual sites including Amazon.
(http://www.worldscibooks.com/economics/6895.html)  The book website has 
some reviews / endorsements.   ISBN 10 981-281-885-5
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Errata
 
Errata for the CD which accompanies the book. These are revisions to the R snippets.
 
Most exercises contain detailed answers with R code
 
Exercises with some answers  for R coding, Chapter 1: Microeconometric Preliminaries (production /cost functions) 
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Exercises2 with some answers  for Chapter 2 Univariate Time Series Analysis  (ARIMA, GARCH)
 
Exercises3  with some answers for Chapter 3: Bivariate Time Series Analysis Including Stochastic Diffusion and Cointegration
 
Exercises4  with some answers for Chapter 4: Utility Theory and Empirical Implications (non-expected utility, stochastic dominance)
 
Exercises5  with some answers for Chapter 5: Vector Models for Multivariate Problems (Causality, Impulse response, canonical correlations)
 
Exercises6  with some answers for Chapter 6: Simultaneous Equation Models
 
Exercises7  with some answers for Chapter 7: Limited Dependent Variable (GLM) Models
 
Exercises8  with some answers for Chapter 8: Dynamic Optimization and Empirical Analysis
of Consumer Behavior (kernel estimation, Wiener-Hopf)
 
 Exercises9  with some answers for Chapter 9 Single, Double and Maximum Entropy bootstrap and Inference
  
 Exercises10  with some answers for Chapter 10 Generalized Least Squares, VARMA, and Estimating Functions
 
Exercises11  with some answers for Chapter 11 Box–Cox, Loess and Projection Pursuit Regression
 
Exercises Contributed by Readers with some answers and R code
 
A recent New York Times article discusses how R is becoming the lingua franca
for data analysts from all fields.  See
http://www.nytimes.com/2009/01/07/technology/business-computing/07program.html?_r=1&em
 
For information regarding a June 2009 New York conference on R see
www.cis.fordham.edu/QR2009