In KDE 4.1, whenever you open a window, it invariably is never opened in a maximised state - something that annoys the crap out of me. While it's something of a chore, the following is how you can sort this out:
- Open the application and right click on its title bar.
- Select the advanced menu and move down to click special application settings.
- In the ensuing pop-up, click on the geometry tab and tick both maximised horizontally and maximised vertically.
- In the drop-downs right next to them, select apply initially and tick the second check-box next to them.
- Clicking OK should save these changes and do the trick.
You can also visit the other tabs, especially the window tab to see how things work. While this can be made generic enough to apply to all windows, it's probably not a good idea as you do want some windows (for e.g., instant messengers) to retain the default geometry.
You can also create general rules for window behaviour by visiting System settings and the window behaviour applet within.
Hope this helps somebody out there!