Seven short years ago I read John Scalzi's Old Man's War and really liked it.
Recently I picked up book two of the Old Man's War series: The Ghost Brigades, and it was like seven years had passed in barely a week.
The Ghost Brigades is filled with action, and races along. It's a quick and entertaining read.
There are still four more books in the Old Man's War series; perhaps I should not wait 7 years between books or I may not finish them all.
Scalzi also has a web site, which I read from time to time.