Best iPhone Market

#1 Fring 0.978 for iPhone

http://fring.com/iphone.xml
Chat with Skype, MSN, Google Talk, ICQ, Twitter, Yahoo! and AIM

#2 BossPrefs

http://code.google.com/p/bossprefs/
The app expands on services by adding some more options (turn wifi/bluetooth on/off etc.) and focusing on being a complete preferences replacement.

#3 iBlacklist

http://repo.iphonebrasil.org/

This application purpose is filtering incoming calls and SMS also keeps a history log of those calls in a personal way protecting them by password.

#4 iDial

http://rep.sosiphone.com
Just look at this:

#5 Swirly MMS

http://swirlyspace.com/SwirlySpace.xml
Send and receive MMS

#6 Torrentula v1.2 BitTorrent client

http://itouch.rockt.es/repo.xml
Download and manage .torrent files with your iPhone

#7 iAno - Virtual Piano

http://modmyifone.com/installer.xml
Virtual piano for your iPhone

#8 Navizon - Virtual GPS

http://repo.navizon.com
Virtual GPS for your iPhone

#9 iPhysics

http://www.installerapps.com/2007/12/05/iphysics/

Must-have game

#10 iPhone System Information

http://www.robota.nl/products/SysInfo.html

And few bonus apps:

Psx4all - Playstation emulator
iSnake - the Snake for your iPhone
iBlackjack - Blackjack for iPhone and iPod Touch