i want to make a app for cydia

[Vaelek]

If you do not have a Mac and want to develop without going through all the work of using toolchains, see the link below. That post also explains developing for the device in the 3.0 SDK without a $99 certificate.

Using the 3.0 SDK without paying for the priviledge | iPhone World

[Cl0ttERS]

Objective-C isn't too hard, i know a few appstore apps that you can get on install0us/i.n.s.t.a.l.l.o.u.s like this one:

http://apptrackr.org/?act=viewapp&appid=334713385

Use that - it's not a half bad tut