Ever make an extensive to-do list, only to lose the scrap of paper you scrawled it on? Probably more times than you can count. Luckily, there are plenty of online tools to help you keep your lists and calendars in order, many of which sync with your phone and help you keep it together no matter where you are.

If your wall calendars and planners aren’t cutting it, here are a few apps to help you stick to those “get more organized” resolutions:

Evernote — One of most powerful and full-featured apps out there, Evernote’s got you set no matter what you need.

The original Evernote lets you save lists, links, notes, documents and files to access from your laptop or phone; Evernote Hello lets you save social info to help you remember contacts, and Evernote Food saves recipes, restaurant experiences and more culinary notes. (Evernote also operates screencap app Skitch, online reading tool Clearly and learning assistant Peek.)

Remember The Milk — If your biggest problem is that you’re overwhelmed with lists, RTM is for you. Its simple design and one-click list management makes it easy to save and organize your to-dos, to-buys, to-calls and whatever else you need to remember.

RTM syncs with iPhone, Andriod, Blackberry, iPad, Google, Twitter and Outlook, so no matter what you use, it’s easy to keep your lists at your fingertips. You can even sign in with your existing Google account.

Todo.ly — This app is similar to RTM, with a slightly different design, letting you organize tasks by project and boasting a design reminiscent of Gmail’s nested threads. With lots of brightly colored can’t-miss cues, one quick scan shows you what you’ve got coming up, when it’s due and which project it’s associated with.

Google — If you’re already a devoted Google addict, their built-in Calendar and Task apps are your best bet. Synced with your existing account with customizable features, they’re as intuitive as the rest of Google’s offerings. And if you already spend all day sitting on Gmail (admit it: you do), the ever-present Tasks tab is a good visual prompt to review your lists.

30 Boxes — A striking, simple design sets 30 Boxes apart from other online calendars. You can view in fullscreen, timeline mode, on your phone or by tag, and share your schedule with contacts. There’s also an integrated tasks list, and you can set SMS reminders for any item.

What are your favorite get-organized apps?