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Solution 1

Views 3 provides solution for your question from the box. It's the Global: Combine fields filter.

1. Add fields

2. Add Global: Combine fields filter to filter criteria

3. Check fields you want to combine in filter's settings

If you use Display suite or teasers mode - force using fields in the View setting.

Solution 2

Views filters populate - good module. But there is 1 problem "only populates STRING exposed filters".

For more info, refer to the Views issue about Apply One Exposed Filter to Multiple Fields.