I bought and installed Windows 7 on my Lenovo X61 laptop recently, and here are some free application I find useful and would like to recommend.

Name: imgburn [Site]
Category: ImgBurn is a lightweight CD / DVD / HD DVD / Blu-ray burning application
Size of download: (v2.5.0.0) 2.1MB

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Name: Brava Reader [Site]
Category: PDF Reader
Size of dowload: (v3.3.0.16) 32.4MB
Drawbacks: Expires every few months. Requires uninstall / reinstall to effect.

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Name: FreePDF XP [Site]
Category: PDF Maker
Size of Download: (v3.24) 1.5MB
Pre-requisite: Ghostscript

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Name: Avira AntiVir Personal [site]
Category: Anti-Virus
Size of Download: 32.39MB
Drawbacks: Check it out here
Alternatives: Avast! Home Edition / AVG Anti-Virus Free Edition 9.0

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Name: Notepad++ [Site]
Category: Source code editor / Notepad Replacement
Size of Download: (v5.5.1) 3.5MB
Alternatives: TextPad (v5.31) – Annoying Reminder on Program Startup if not purchased. Simplyjean informed me that this is the only program that could open a 2GB text file.

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Name: 7-Zip [Site]
Category: File Archiver (Can open these format: ARJ, CAB, CHM, CPIO, DEB, DMG, HFS, ISO, LZH, LZMA, MSI, NSIS, RAR, RPM, UDF, WIM, XAR and Z)
Size of Download: (v4.65) 1MB

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Name: VideoLAN VLC media player [Site]
Category: Media Player supporting most audio & video formats
Size of Download: (v1.0.3) 17.2MB

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Name: Password Safe [Site]
Category: Password Manager
Size of Download: (v3.19) 4.4MB

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Name: FileZilla FTP Client [Site]
Category: FTP Client
Size of Download: (v3.3.0.1 Freeware) 3.9MB

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Name: Gadwin Print Screen [Site]
Category: Screen Capture Program – for capturing a part of a screen and not just the full screen or a window.
Size of Download: (v4.3 Freeware) 2.75MB

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Name: xMarks [Site]
Category: Browser Bookmark Manager – Works for IE / Firefox / Safari / Google Chrome
Size of Download: Depends on browser used.
Drawbacks: Requires a separate installation for each browser.