Tricks to manage the available memory in an R session

Question

What tricks do people use to manage the available memory of an interactive R session? I use the functions below [based on postings by Petr Pikal and David Hinds to the r-he

Answer 1

Running

for (i in 1:10) 
    gc(reset = T)

from time to time also helps R to free unused but still not released memory.