My thoughts. All of these are from application manager.

No icons at all:

• Call forwarding applet
• Custom Operator Name Widget
• KMPLayer
• liqtorch
• maemo-geolocation
• maemo-org
• nmap
• orrery
• Pidgin Language Support
• proximityd
• pypianobar
• worldtv99

Icons that are blurry:

• cpumem-applet

Icons that could be larger:

• anarchism
• belltower
• DateJinni
• DiceJinni
• DiskUsage
• eCoach
• EightyOne
• Extended Call Log
• FindMine
• free42
• freecell4maemo
• Gboggle
• GiveMeFive
• Gnuplot
• GPSJinni
• htop
• Irssi
• Kandis (also too dark so can't see outline against dark backgrounds)
• Mad Bomber
• maelstrom
• MathJinni
• MGutenberg E-Book Reader
• Mirror
• MMagnetic
• nspeed
• Ogg Support
• OMWeather database for gismeteo.ru
• PackageView
• Password Safe
• Pidgin Extra Protocols (Bonjour and Sametime)
• Pidgin Internet Messenger
• Pidgin Status Menu Plugin for Maemo 5
• PushIt
• Puzzle Collection
• QStarDict
• Recorder
• robotfindskitten
• RulerJinni
• Scopa
• Sharing Plugin for Picasaweb
• Simple FMTX desktop widget
• stopish
• TabletBridge (also too dark so can't see outline against dark backgrounds)
• Tennix 2009 World Tour
• Thai fonts
• The Milky Way Wallpaper
• TimerJinni
• Tuner
• tweakr
• ussd-widget
• Vagalume
• vncviewer
• WhoAmI
• WifiInfo (also too dark so can't see outline against dark backgrounds)
• Wormux
• xkblayouts-rx51-ru
• zoutube

Other problems, like icons that don't seem to match applications, or are unclear:

• AccDisplay: nice clean icon, but it looks like a synchronisation app icon rather than anything to do with accelerometers. Sorry I don't have any better ideas.
• Conky: Unsure why the icon is a person!
• Conversations Inbox Desktop Widget: Odd icon.
• Currency Converter
• Desktop Activity Manager
• Easy Chroot: Not sure what to suggest instead, though!
• QuickNote: bit too messy