Service Unavailable error message when you browse a MOSS / WSS site or Central Admin.

IIS must be the reason for this. Do an IIS reset and see. If the problem persists, Just check the farm administrators password which has been set on the Application Pool.
To see this, go to Application Pool of both your site and the Central Administration site and right click to see the properties. Go to Identity tab and see the account name.

Make sure that the password is latest. If your network policy is defined some password expiration policy, you must have changed the password of the farm admin's domain password. Some times this to be reset in the Application Pool also. Do it for all the application pools of the sites which are not running and saying 'Service Unavailable'.
Give the new password in the identity tab and reset the iis.
run>cmd> iisreset
Hope it works fine now.

Export Excel Data to SQL Server Database

Stored procedure for Exporting data from Excel Sheet to SQL Server Table.

CREATE TABLE [dbo].[MyAddressTable] (
[FirstName] VARCHAR(20),
[LastName] VARCHAR(20),
[ZIP] VARCHAR(10)
)
GO

SELECT * FROM [MyTestDB].[dbo].[MyAddressTable]

INSERT INTO [MyTestDB].[dbo].[MyAddressTable] ( [FirstName], [LastName], [ZIP] )
SELECT [FirstName], [LastName], [ZIP]
FROM OPENROWSET('Microsoft.Jet.OLEDB.4.0',
'Excel 8.0;Database=E:\sabin\Try.xls;IMEX=1',
'SELECT * FROM [Sheet1$]')

It does not need to have excel to be installed in the Server machine where SQL Server is installed. All you need to have is a file of .xls in the server.

OPENROWSET featire to be enabled through SQL Server Surface Area Configuration.
Start > SQL Server 2005 > Configuration Tools > Surface Area Configuration

Click Surface Area Configuration for Features
Click on Database Engine and Check the Enable OPENROWSET and OPENDATA..

Done !