By PC World Downloads Team

We've gathered up our best downloads and put them in handy, browsable collections.

These are among the most popular collections of downloads we've produced in recent months.

When you open a link, you'll see a list of the downloads we've picked. Simply click on the name of the download that interests you, read our mini-review, and if you're still interested, download away!

• System Tune-up Tools -- Use these tools to clean out the junk and add new pep to your PC.
• The 15 Best Downloads of the Year -- Our downloads gurus have selected the 15 best utilities, productivity tools and other apps of 2007 from PC World's vast Downloads Library.
• Dress Up Your PC -- Tired of the way Windows looks? No problem -- you can dress it up just about any way you want, and these downloads will help you do it.
• 14 Fantastic Freebies -- Get to your favorite folders in a snap; Stream TV stations from around the globe.  Add new power to Internet Explorer.  All this and more, and all of it for free.
• Have a Happy Valentine's Day -- Win over your Valentine with these fun programs.  Craft a card, consult the stars and decorate your sweetheart's screen.
• Downloadable Fun & Games -- Have a ball with these games and puzzles, many of them free, while you are whiling away the hours this holiday season.
• Speed Up Your PC -- You can have a zippier, more responsive PC -- you really can.  You just need the right tools. These can help.
• Ad Blockers That Really Work -- If you're tired of annoying pop-ups, flash ads and the rest, you'll find these downloads useful.  Check the reviews thoroughly, however, as some are more effective at different tasks.
• Hard Disk Utilities -- These tools will help you clean up, organize and generally improve your hard disk.
• Timesaver Software -- These downloads can simplify your life.  They will automate common tasks and can also replace several Windows programs that don't quite do the job.
• Must Have Downloads -- Here is the complete list from our October 2007 article, "The 20 (Mostly Free) Downloads You Can't Do Without."
• Recovering From Disaster -- You've totally screwed up.  Lost files, accidentally deleted stuff.  What to do?  Doctor, doctor: Here are the cures.
• Backup Tools to The Rescue -- These downloadable programs, most of which you can try out before buying, can truly save you when some kind of disaster hits your desktop or notebook.
• Free Games & Great Timewasters -- New additions to our library; some are demos, others are full-featured freeware we think you'll enjoy.
• New Vista Downloads -- These files can help you optimize your PC and notebook Vista operating system.