From marking its first year this past summer, to boasting over 100,000 applications in its catalog, the App Store has been great for many developers on the iPhone platform this past year. With 2010 right around the corner, we wanted to take a look back at the 100 greatest iPhone apps of 2009. These applications were nominated by Mac|Life readers. All of these apps have something in common: They've helped make the iPhone better over the past year. 

MobileMe iDisk (free)

This little iPhone app lets MobileMe users browse through files stored on their iDisk with ease. The app also lets you view files like PDF, Microsoft Word, Excel, PowerPoint, Image files, and iWork files. In addition, you can share files right from your iPhone.

Evernote (free)

Evernote is the free online service/application that lets you store notes and images in notebooks for later use. The iPhone application really comes in handy, especially since it syncs with the cloud. Coupled with the new offline viewing for premium users, Evernote has to be one the best iPhone apps, hands down. 

Facebook (free)

It seems like all of our friends are on Facebook these days, so why shouldn't Facebook be everywhere? Well, with their iPhone application it can definitely seem like that. This application allows you to manage all of your friends, posts, messages, uploads, and otherwise use Facebook without being inside of a browser.

Shazam (free)

Without this wonderful application, we would still have that snazzy song stuck in our heads without knowing the title or band. Shazam provides a great service to iPhone users for the wonderful price of free; however, if you're into product(RED), they have a Shazam(RED) version available as well.

Tweetie 2 ($2.99)

It seems like Twitter is becoming as ubiquitous as Facebook, and it also seems like there are a bevy of iPhone Twitter clients. Tweetie would have to be a newcomer that won the hearts of the iPhone users everywhere. Multiple Twitter accounts, contact linkage, multiple attachments, offline mode, and more. Tweetie 2 has you covered.

Twitterrific (free)

Twitterrific is the great-granddaddy of Twitter clients on the Mac and iPhone, but it doesn't disappoint. Twitterrific got a new face lift this year that updated the client to be in line with other clients like Tweetie. By far, this is the nicest looking Twitter client on the iPhone.

SimplyTweet ($4.99)

With the advent of push notifications for the iPhone, SimplyTweet is probably one of the cheapest solutions for bringing push to your tweets. This app also contains all of the features of other comparable Twitter clients.

Zipcar (free)

Zipcar is one of those revolutionary applications, giving you the ability to not only pick out a rental car from the Zipcar service, but also unlocks the doors on the car right from the iPhone.

Dropbox (free)

This small newcomer of a company has shown time and time again that they can play with the best when it comes to online storage in an iDisk-style fashion. Dropbox offers up 2GBs of free online storage to users (along with other premium paid services). With their iPhone application, you can view and manage files on-the-go with ease.

Pastebot ($2.99)

With iPhone 3.0, cut, copy, and paste became a reality on the iPhone. With Pastebot, multiple clippings in an easy to use clipboard manager become a reality. This application also lets you sync over your clippings from your Mac to iPhone and vice versa.

Stanza (free)

With Amazon Kindle-like finesse, Stanza lets you read eBooks on your iPhone for free or little cost. Download free Guttenberg Project books, or paid books from several publishers right from the app; then sit back and read.

TomTom U.S.A. ($49.99)

This year gave way to turn-by-turn GPS navigation apps for the iPhone. TomTom is one of the many GPS apps available that is really well designed. This app has 3D maps, fast route calculations, and a new lower price that many iPhone owners will enjoy.

Navigon MobileNavigator ($59.99)

With maps from NAVTEQ, and features like Lane Assist Pro, Navigon is a great navigation app for the iPhone. The app also includes Google local search, iPod control, and bird's-eye view of maps.

Things ($9.99)

Sure, it's been around since the App Store launched, but it gained tighter syncing with its Mac counterpart, which makes it all the better. Things is a complete GTD (Getting Things Done) solution for your Mac and iPhone.

1Password Pro ($7.99)

What would we do without 1Password? This handy application manages all of our passwords on both the Mac and the iPhone. And with the pro version, you get all kinds of nifty features like copy/paste passwords, folders for managing, and copying multiple field values. If you're always forgetting your passwords, this app is for you.