Throughout this week, we're collecting nominations for the Lifehacker Awards 2011. Our category today: web apps.
As with mobile apps, some web apps are useful because they work in conjunction with desktop software. Others are handy because they give you access to features through a browser without forcing you to install software. But whichever web apps you love and can't live without, if you think they should be on our shortlist for voters, tell us (and tell us why) in the comments.
Don't forget you can also offer nominations in our best domestic airline, best desktop software, best ADSL/cable ISP, best mobile app and best mobile broadband categories, and there'll be more categories to nominate in throughout the week before voting starts on Monday November 21.