I have been able to copy and paste from/to a few apps without anything special installed. I am a newbie with smart phones so I might not have the community language right. I'm sure there are other copy/paste combinations hidden down in some menu trees.
Example: Copy from Web Page to Text Message or eMail >>
1. While in Browser, Press MENU Key. Then select MORE. Then select SELECT TEXT. Then swipe across the area to be copied. When you release your finger, the selected text will go to the clipboard. This will take a little practice!
2. Start a new eMail or Text Messge. Long Press in the Message Body (says "Enter message here" in my apps). Select PASTE or PASTE FROM CLIPBOARD, and the dirty deed is done!
Note: PASTE will paste the last thing copied. PASTE FROM CLIPBOARD will present all the items stored in the clipboard. A neat way to copy several items and paste them into one message.
Keywords; Copy, Paste, Droid X, Web Page, Browser, email, text message.