1. DJIA rose 497.46 points, reaching 48,057.75, a one-month high. 2. Federal Reserve cut interest rates to 3.5%-3.75% and announced Treasury purchases. 3. Investor optimism grows amid expectations of continued equity rallies. 4. Potential economic data releases may challenge current bullish sentiment. 5. S&P 500 and DJIA see significant year-to-date gains, bolstering market confidence.