Here's a new app from coder Frostegater - XMB Item Hider, as the name suggest, this handy homebrew plugin allows you to hide some icons of your XMB.

Changelog:

• Added hide UMD Update Icon (non PSPgo).
• Added 5.00/5.02/5.03/5.50 compatibility.
• Added hide GO!Messenger icon (5.xx).
• Added "[Global]" category: USE_PLUGIN, HIDE_ALL, HIDE_ALL_SETTINGS, HIDE_ALL_EXTRAS, HIDE_ALL_GAME, HIDE_ALL_NETWORK, HIDE_ALL_PSN.

Developer's note:

Plugin that allows to hide some icons in the XMB . Icons "Memory Stick ", "Memory System", "Resume Game" and "Management preserved. Data" can not be hiding. If you prefer, you can continue to develop plug-in

Plugin support:
5.00/5.02/5.03/5.50/6.20/6.35/6.36/6.37/6.38/6.39/6.60

Just a little note from the dev, the plugin will not work properly with the XMB Control (xmbctrl) installed.