Here is a list of the top 10 most dedicated Mac OS X apps that will also be useful with Mac OS X Lion:

Tab Launcher 1.1 – Tab Launcher is a productivity app for Mac OS X 10.5.1 or later versions. The aim of the app is to make sure that the system’s dock is clean and organized with only the active applications on display. The app also gives you the option of creating as many tabs as you like, and you can later personalize them by setting the title color, background color and font. Tabs can also be rearranged by dragging them. The app is available for $0.99.

Cloud 1.5.1 – You will just need to drag a file from your Mac to the CloudApp icon in the menu-bar and the app will automatically copy it to your clipboard which you can later share with a friend via Twitter, IM or email. You can also view your last 5 drops from the menu-bar, and personalize upload notifications. The app is free for download and developed for Mac OS X 10.6 or later.

PhotoSync 1.2 – PhotoSync is a free app for Mac OS X 10.6 or later. This photography app will let you make wireless transfer of your photos and videos to or from your iPhone, iPod touch and iPad. This 1.2MB app will let you drag photos and videos to the Menu-Bar-Icon to send them to an iOS device. PhotoSync also supports direct import into Aperture and iPhoto.

Opus Domini 1.5 – This is a productivity app which works as your personal planner and management application. The app provides you with features such as daily tasks, goals, meeting planner, weather info and subtasks. Password protection is also available. The app requires Mac OS X 10.6 or later and is available for $8.99.

Mactracker 6.0.2 – This is a free app which requires Mac OS X 10.5.0 or later. Its main aim is to provide comprehensive information on every Apple Macintosh computer ever made, which include items such as processor speed, memory, optical drives, graphic cards, supported Mac OS versions, and expansion options. Information on Apple mice, printers, scanners, digital cameras, iPods and keyboards is also included.

MiroVideoConverter 2.3 – A simple yet elegant video convertor that lets you convert almost any video to h.264, MP4, WebM (vp8), Ogg Theora, or for Android, Droid, iPhone, iPod, iPod Touch. The app is free for download and requires Mac OS X 10.5 or later.

PhoneCopy for Mac 1.5 – A productivity app that lets you backup and sync contacts, events, notes and messages from your mobile device. The app provides free of charge unlimited, cross-platform, smartphone and featured phone synchronization, with real time access to data via your web browser. Wi-Fi or your current data plan is all that it takes to synchronize your data. The app is for free and has been developed for Mac OS X 10.5 or later versions.

NowPlaying for Mac 2.0.1 – This $1.99 app, which requires Mac OS X 10.6 or later, provides you with information about the current music track in the menu bar and provides basic playback controls. The app integrates itself into the menu bar, taking no desktop space, no dock icons.

Quick Note 1.3.1 – This free app has been designed for lightweight note-taking. The app provides options to add and edit notes in the app, and instant search for all notes. This small app (0.7MB) requires Mac OS X 10.6 or later.

ACTPrinter for Mac 1.5 -- ACTPrinter for Mac is the free companion application to the PAID iOS application ACTPrinter for iPhone & iPad. The app allows you to print any document from your Mac to your iPhone, iPad or iPod Touch. You can print documents, emails, webpages and more from any program on your computer directly to your mobile device. Mac will automatically detect your iOS device when connected to your AirPort or WiFi network, and there is no need to type in an IP address. The app requires Mac OS X 10.5.2 or later, and a 64-bit processor.