Get Next Unique ID From A Table Before Insert @@identity / Sequence

How do I get the next int value for a column before I do an insert in
MY SQL Server 2000? I'm currently using Oracle sequence and doing
something like:

select seq.nextval from dual;

Then I do my insert into 3 different table all using the same uniqueID.

I can't use the @@identity function because my application uses a
connection pool and it's not garanteed that a connection won't be used
by another request so under a lot of load there could be major problems
and this doens't work:

insert into <table>;
select @@identity;

This doesn't work because the select @@identity might give me the value
of an insert from someone else's request.

Thanks,

Brent