The first one is for both personal and business and said to expire 12/19/2011. Spend $3,000 within 90 days and get 45,000 miles. The 1st annual fee ($95) is waived as usual. The business version even offers additional $100 credit if you purchase a Delta ticket within 6 months. If you signup both, you may get 90,000 miles.
The application page for personal card (45K) [DEAD as of 1/6/2012]
The application page for business card (45K + $100) [DEAD as of 1/6/2012]
The second offer is for business card only. 25,000 miles after your 1st purchase and an additional 30,000 miles after your spend $10,000 within 6 months. The 1st annual fee is also waived.
The application page for business card (55K) [DEAD as of 5/31/2012]
Please note that the up to 50K miles offer is still on. But for that one, you need to put in your SkyMiles number and your may get a lesser offer.