Yes - only one account per free user. If you go here you can temporarily upgrade your account to a paid one, but it goes away when open beta goes live on April 30. At which point if you still want a paid account, you'll have to actually pay for it. :-) Paid accounts can add up to 5 other services for crosposting, although I believe at this time they must be LJ or LJ clones like Insanejournal or Deadjournal.