extracting the last row of each group in a data frame

Hi,

I would like to extract the last row of each group in a data frame.

The data frame is as follows

Name Value
A 1
A 2
A 3
B 4
B 8
C 2
D 3

by(dfname$Value, dfname$Name, tail, 1) #which gets you a list

Or:

aggregate(dfname$Value, list(dfname$Name), tail, 1)  #which returns a  
data.frame
   Group.1 x
1       A 3
2       B 8
3       C 2
4       D 3

I would like to get a data frame as
Name Value
A 3
B 8
C 2
D 3

David Winsemius, MD
Heritage Laboratories
West Hartford, CT