Is it good practice to attach [SOLVED] to a solved question's title? I know this helps a lot when searching forums, but in a SO environment there is a visual clue for solved questions.
Marking an answer as accepted is the signal that the question is solved. We are not a forum, and there are mechanisms to look for questions that have answers and are accepted answers:
answers:3questions that have 3 or more answers.
answers:0questions that have no answers.
isaccepted:yesanswers marked as accepted.
hasaccepted:noquestions that don't have accepted answers.
If someone's answer solved your question, mark it as accepted or upvote it. Please, don't edit questions to add
[SOLVED] to the title. If you see a question that has the answer embedded in the question, either comment to the author that he could answer his own question, or edit the question and add the answer yourself.
Related questions about this: