I believe that making knowledge of non-Saito weapons systems more freely available would help Aikido growth as students would be able to study and compare the alternate systems, but I would welcome differing opinions
Learn the system(s) your teacher offers. That's for free. And you won't learn something usefull from clips or dvd if you try it without a teacher.
Over here the weapons of Inaba Minoru are quite popular and teached by Tissier Sensei. You can find a lot on youtube. But you won't be able to learn this from just watching.