Now there are different way you can deploy your solution package into sharepoint.If you are looking for WSP Builder Project You can download it from following link http://wspbuilder.codeplex.com/Release/ProjectReleases.aspx?ReleaseId=24627 .Its a visual studio extension.
Playing with STSADM for solution deployment
we can use our sweet and dirty comandline tool STSADM.
You can find stsadm.exe in C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN
Solution Pack Deployment
Step1 : Add the solution pack (Only added solution pack can be deployed)
stsadm -o addsolution -filename
example : stsadm -o addsolution -filename c:\ShyjumohanBlog.wsp
Step2 : Deploy the solution pack
stsadm -o deploysolution -name
example : stsadm -o deploysolution -name ShyjumohanBlog -immediate -allcontenturls -allowgacdeployment -allowcaspolicies
-immediate - Going deploy it immediately
-allowgacdeployment - WSP pack contains some dll's which should goes to GAC.
If you need to delete a solution pack use the following command
Step1 : Retracts the specified solution’s deployment.
stsadm -o retractsolution -name -immediate -allcontenturls
example : stsadm -o retractsolution -name ShyjumohanBlog -immediate -allcontenturls
The retractsolution operation removes files from the front-end Web server
Step2: Delete the solution
stsadm -o deletesolution -name
example : stsadm -o deletesolution -name ShyjumohanBlog
The deletesolution operation deletes the solution package in the solution store of the configuration, and should only be called after solution packages have been retracted.