A few more Jailbreak "tweaks" to consider...
Ever notice how people texting at night have that eerie blue glow? Or wake up ready to write down the Next Great Idea, and get blinded by your computer screen? During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun.
F.lux fixes this: it makes the color of your iPhone's display adapt to the time of day, warm at night and like sunlight during the day.
It's even possible that you're staying up too late because of your iPhone. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your iPhone look better. (Also available for your Mac.)
I really like this one. It's just kind of nice for it to warm the colors in the evening.
I give it two jkams:
Activator based iPhone 4 LED flashlight. Default activation method is to double tap the power/sleep button. But you can assign any activator event to enable the LED torch for a bright LED flash light. To change the activation method, after installing and respringing, go to settings app, activator, and assign the flashlight to an action of your choice.
This one can be dangerous. If you accidentally double tap the power/sleep button or press it one too many times while you're putting the screen to sleep and shove your iPhone in your pocket you may inadvertently activate SpringFlash, not realize it, and be surprised to find out you've completely run your battery down without knowing it the next time you pull your phone out to use it. Don't ask me how I know this.
You can assign any activation method you want to this, but the power/sleep button was the big seller because you didn't have to unlock your iPhone in order to activate the flashlight. I've since removed this one from my iPhone.
This one gets one Muttpark.
A tweak to give you more control and an much, much easier method of selecting text.
Rather than try to describe it, here's a video of it in action. Warning: Annoying music.
After working with this one for months, I maintain it's worth jailbreaking your iPhone for this "tweak" alone.
I wouldn't be surprised to see Apple implement this as part of the iOS soon. Nearly everyone in who has jailbroken their iPhone is using it.
This one gets three ADVSalutes.