Biggest stock exchanges in the world:

1. NYSE

2. Nasdaq

3. LSE (London Stock Exchange)

4. Tokyo Stock Exchange

5. Euronext

Basic indexes:

Dow Jones Industrial Average (NYSE & Nasdaq)

S&P 500 (NYSE & Nasdaq)

Nasdaq Composite (Nasdaq)

FTSE 100 (LSE)

DAX 30 (Frankfurt Stock Exchange)

NIKKEI 225 (Tokyo Stock Exchange)

MICEX (Moscow Interbank Currency Exchange)

RTSI (Russian Trading System)

Euronext 100 (Euronext)

Sites about stock exchanges and finance:
Yarovoiy.com - интернет-трейдинг, аналитика по акциям (Russian - internet-trading, analyses on shares)
YStockCharts - stock news

Other sites:
Zlat.info - property in Bulgaria