When writing apps hopefully, like me, you roll over your logs and compress them to conserve space. However, also like me, you have to check those files in a production or production-like environment. Which means either logging in as some super-user, or downloading the files, or copying them to some /tmp directory, when you can unzip the files, and read them.
Or you could save yourself a couple of unnecessary steps and just think in CLI using the "-c" flag for gzip, then pipe the output to less, more, or wherever.
bash> gzip -cd rolledover.20120510.log.gz | less