Dannyalcatraz said:
I can understand why, but there's an issue of Dragon that contained a bunch of Soulknife feats, including Practiced Mindblade (or some such) which allows your PC to gain +4 levels of mindblade powers (similar to the other "Practiced" feats)- it goes a long way towards alleviating the problems of multiclassing.
In general it is not good to multiclass a Soulknife, but it depends on what you want out of them. If you simply want the ability to manifest a mindblade, all you need is 1 level. If you actually want to power the blade, then you should stay as a soulknife. Any idea which edition the mindblade feats are in? The Practiced Mindblade seems like a great feat.
Anyway, I woked some things and figured that a Monk 1/Soulknife 1/PsyWar 18 would be a decent build. You'd need Expanded Knowledge to pick up Suggestion (jedi mind trick), Telekinetic Force (force grab) and Telekinetic Thrust (force push). You could substitute Telekinetic Force with Far Hand to get it earlier, but it has it's limits. Some other jedi-like powers might be Catfall and Levitate (since there doesn't seem to be a Jump power). This build would definately benefit from Practiced Mindblade.
Another build Monk 2/Soulknife 1/PsyWar 17 to pick up Deflect Arrows (to simulate blocking projectiles with the "light sabre").
The last build I came up with is Monk 1(or 2)/Soulknife 5/PsyWar 14 (or 13). This will get you some mindblade boosts. You'd need to be a half-human and take the feat from Races of Destinty which allows a second favored class so you don't get an XP penalty. Also with this build you can reshape the mindblade into a long sword or bastard sword (seems more fitting as a lighsabre than a shortsword) as well as take the feat to turn it into a double bladed sword
