This might be a little late to implement in Maemo 5, but could still carry on over to MeeGo (Harmattan or MeeGo 1.0) core applications (Phone, Maps, Contacts, App. Manager, etc.).
Brainstorm
Brainstorms
Method of updating manufacturer provided software (a.k.a. Core applications).
Posted on 2010-05-13 20:35 UTC by Andy Pham. Status: Under consideration, Categories: Open sourcing.
Allow a single contact on the desktop more than once.
Posted on 2010-05-21 19:05 UTC by Robin Powell. Status: Under consideration, Categories: Desktop.
To help if my phone is lost, I have a "PHONE OWNER" contact. I want to place a link to this contact on each desktop, but I can't because each contact can be placed on the desktops only once, so I had to make 4 such contacts, which is really annoying.
Please fix.
-Robin
Smoother Fade In for Alarm Sound
Posted on 2010-05-27 05:02 UTC by Sergey Vlasov. Status: Under consideration, Categories: System.
Currently it sounds too harsh, each rise follows with crackles. For alarm it is important that volume fades in very gently.
Discussion thread:

Access the N900's desktops quicker
Posted on 2010-05-27 14:25 UTC by Pelau Vadim. Status: Under consideration, Categories: Desktop.
An easyer way to reach any of your desktops without having to swipe multiple times.
Forum link: http://talk.maemo.org/showthread.php?p=682864#post682864
Happy to read your opinions below :)
automatic rotation of camera photos
Posted on 2010-05-28 11:11 UTC by Michael Becker. Status: Under consideration, Categories: Media.
Today when I went through my photos I wondered why photos wich are taken in protraitmode (e.g. device held vertically) are not rotated automatically using the build in accelerometer of the N900?
This could be a great feature.
Thread referencing to this idea: http://talk.maemo.org/showthread.php?p=692028#post692028