Every week we look at a specific topic and ask, which is best? From malware removal to home servers and wallpaper, here's a look back at the most popular Hive Five topics of 2009.

This year's release of Firefox 3.5 gave us a lot of reasons to like it, but its extensibility remains everyone's favourite feature. These add-ons and theme tools were the most popular in the year gone by.

The iPhone is the most popular mobile phone in the US, and with good reason. Despite occasionally awful choices by Apple, it still has the most — and best — applications around. Here are the most popular free iPhone apps (and posts) of 2009.

We're huge fans of repurposing here at Lifehacker — squeezing extra and usually clever uses out of everyday objects. Here's a look back at some of the most popular repurposing posts from 2009.

Every week we bring you fresh workspaces supplied by you — the awesome Lifehacker readership. Today we're highlighting the 25 most popular workspaces of 2009.

Our readers have submitted thousands of screenshots of their best desktop configurations, and over the year we've featured some truly impressive and unique desktops with you. Here's a look back at some of the best this year had to offer.

A new browser, two new Ubuntu releases, and more than one new netbook OS — 2009 was a big year for open-source software. Here are the Linux-related posts that caught our readers' attention in 2009.

When technologists of the future look back in time, they'll remember 2009 as the year Google got serious about an internet operating system, speeding up the web and indexing EVERYTHING in sight. Take a look at the year 2009 in Google.

Nothing beats finding just the right application to fill a common need, fix a problem or boost your productivity. Give yourself an early Christmas present with 15 of the most popular Mac downloads of 2009.

We've featured hundreds of free Windows applications over the course for 2009 that we hoped might bolster your productivity, workflow, or your PC usefulness in one form or another. Here's a look back at the most popular Windows downloads of the year.

All-things BitTorrent weblog TorrentFreak broke down the numbers and rounded up the 25 most popular torrent sites of 2009.

Every weekend, we comb our memories and archives to compile 10 useful items addressing a specific topic you may have forgotten about, or just happen to be excellent. Here are the list(icle) posts that proved the most popular in 2009.