ABC said:

Anyone here familiar with R for microarray analysis? I would like to know the code for generating smooth density estimates of expression values I generated using the rma function in R. I'd like the results on one graph. Six chips in total. Any help would be appreciated.

I have found this book to be pretty useful in the R for microarrays department:

Bioinformatics and Computational Biology Solutions Using R and Bioconductor (Statistics for Biology and Health Series)
by Robert Gentleman (Editor), Wolfgang Huber (Editor), Vincent Carey (Editor), Rafael A. Irizarry (Editor), Rafael Irizarry (Editor)