Share your experience!
CoolDesign started one of these for the Mini, although I love my phone I thought it was a good idea so decided to start one for the Mini Pro (2011 version). Check out the other thread too (http://talk.sonyericsson.com/message/107847#107847) as I'm sure alot of features will be shared, I've copied some into this thread.
Please post enhancements only, not bugs or issues with your phone... unless of course it is something that needs enhancing! I'll try to copy them into this post to keep them all at the start.
Added (25/10/2011):

** Just to add uliwooly-wooly posted some useful apps which provide this functionality (the starred items). See here and here or scroll down.
Solved! Go to Solution.
I have the black too, and the keyboard light seems ok to me. But it's annyoning because it turns off constantly, and in dark rooms I have to press a random key to light it up again.
I suggest an option to enable/disable the keyboard to use the light sensor, so it will be permanently on in dark areas and off outside.
Also other apps cannot see the light sensor, even "sensor testing" apps report that the phone doesn't have one.
thats so true...i'm sure if we nagg enough they would fix it in a way 
Since this is a feature request, I actually have quite an idea but I dunno if you guys agree or not
In my Dell Studio 14, the keyboard backlit does not depend on sensor but I have to press the backlit button to turn the backlit on. There are three levels. Bright, dim and off.
So I was thinking that if the globe button in the SK17i keyboard can be used to do the same as my laptop does, changing the backlit level manually rather than the sensor doing it for you. Besides, the sensor is not accurate and I think most of us seldom use the globe button.
Please, turn back the screen off animation, the update to 2.3.4 removes it. I don't know why the major part of the manufacturers are removing it.
camera / picture quality - it's not about the compression [although it's suspicious, at 500kb for 5mp!].
it's about the EXTREME NOISE REDUCTION, which kills all the detail. After that it's no surprise that the files are small - there's no detail left to be compressed...
The Request:
either turn down the NR by at least a quarter.
OR
make it possible to choose the level - or even to apply it manually, ex-post.
Compression level [at least 3] is optional bonus.
Comon SE! my P1i 3mp cam gives better pictures in moderate light!
compare:
https://www.dropbox.com/s/ukrxcktta5asvqs/whiteroom-P1i.JPG
https://www.dropbox.com/s/noapvbz8s8u02nu/whiteroom-SK17i.jpg
Fair enough, you don't get a great camera in mid-range android phone. But at least don't cripple it with no-options, no-controls!
What's the point of "scene selection" if the quality of 5mpix is hardly good enough for a post stamp...
sony pls do something abt d keyboard light problem on white mini pro.....its quite annoying as v cant c d letters on the keyboard in dim light.......wats d use for paying xtra for pro???.......pls v need a fix real soon....
FEATURE REQUEST:
SE can you give us a better saved password management in the browser?
cause I type the wrong password when I try to sign in to this forum and I pressed remember password.
And in order to erase that I also need to erase all other saved passwords.
I dont wan to use third party browsers as the stock browser have scrolling while pince to zoom.
Feature Request:
1. Show no empty app drawer on home, it's annoying seeing an empty quarter circle on my screen 😕
2. repeat/repeat all function in stock music player
3. loseloss format eg: flac/ape support in stock music player! I know there's app on market but i like how the stock player look 
4. Auto-brightness On/Off
Erm... Does anyone notice that when you access the gallery through the messaging app to send a mms it shows no picture at all? I close and open gallery again and it didn't show anything... I check my file using astro file manager and my pictures are still there just that the gallery is not reading them...
Hi, just tested it out, no problem in adding picture from Gallery to mms.
Reboot phone and try again (for a start).