nc-1.100 is available in Rawhide, see bug 681824
I have nothing against getting this to f14 & f15 so if there's an interest in that, I'll build it for those.

nc-1.100-1.fc15 has been submitted as an update for Fedora 15.
https://admin.fedoraproject.org/updates/nc-1.100-1.fc15

nc-1.100-1.fc14 has been submitted as an update for Fedora 14.
https://admin.fedoraproject.org/updates/nc-1.100-1.fc14

Thanks.  I was considering upgrading to rawhide anyway, but am glad that I found something that needed to be pushed backwards.

Package nc-1.100-1.fc14:
* should fix your issue,
* was pushed to the Fedora 14 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing nc-1.100-1.fc14'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/nc-1.100-1.fc14
then log in and leave karma (feedback).

nc-1.100-1.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

nc-1.100-1.fc14 has been pushed to the Fedora 14 stable repository.  If problems still persist, please make note of it in this bug report.

Doesn't work on i686 for me (F-14). I get:

---------------
$ nc localhost 22
nc: port number fͿfͿfͿ: 22
$ 
---------------

SSH is listening on localhost on that box.

Works on x86_64 though.

Downgrading to nc-1.84-23.fc14.i686 fixes the issue immediately on i686.

You mentioned some garbage output in Bodhi. Do you mean the "string" between the word 'number' and '22' or something else?

(In reply to comment #10)
> You mentioned some garbage output in Bodhi. Do you mean the "string" between
> the word 'number' and '22' or something else?

Here is the full output when I run it within gdb, all debuginfo loaded:
--------------
$ gdb nc
GNU gdb (GDB) Fedora (7.2-46.fc14)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/nc...Reading symbols from /usr/lib/debug/usr/bin/nc.debug...done.
done.
(gdb) set args localhost 22
(gdb) r
Starting program: /usr/bin/nc localhost 22
nc: port number���������: 22

Program exited with code 01
--------------

So, it doesn't really crash, just runs prints the above to stderr and exits with code 1.

Maybe this will help:
--------------
[bsmojver@vwpdk526 ~]$ gdb nc
GNU gdb (GDB) Fedora (7.2-46.fc14)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i686-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/nc...Reading symbols from /usr/lib/debug/usr/bin/nc.debug...done.
done.
(gdb) set args localhost 22
(gdb) b netcat.c:115
Breakpoint 1 at 0x804a414: file netcat.c, line 115.
(gdb) r
Starting program: /usr/bin/nc localhost 22

Breakpoint 1, main (argc=<value optimized out>, argv=<value optimized out>)
    at netcat.c:122
122		const char *errstr, *proxyhost = "", *proxyport = NULL;
(gdb) n
288		if (xflag) {
(gdb) 
122		const char *errstr, *proxyhost = "", *proxyport = NULL;
(gdb) 
288		if (xflag) {
(gdb) 
316		if (lflag) {
(gdb) 
373		} else if (family == AF_UNIX) {
(gdb) 
390			build_ports(uport);
(gdb) 
nc: port number���������: 22

Program exited with code 01.
(gdb)
--------------

Some more:
--------------
(gdb) r
Starting program: /usr/bin/nc localhost 22

Breakpoint 1, main (argc=<value optimized out>, argv=<value optimized out>)
    at netcat.c:122
122		const char *errstr, *proxyhost = "", *proxyport = NULL;
(gdb) n
288		if (xflag) {
(gdb) 
122		const char *errstr, *proxyhost = "", *proxyport = NULL;
(gdb) 
288		if (xflag) {
(gdb) 
316		if (lflag) {
(gdb) 
373		} else if (family == AF_UNIX) {
(gdb) 
390			build_ports(uport);
(gdb) s
build_ports (p=0xbffff61e "22") at netcat.c:766
766		int x = 0;
(gdb) n
762	{
(gdb) 
769			comma = strchr(p, ',');
(gdb) 
770			if (comma)
(gdb) 
769			comma = strchr(p, ',');
(gdb) 
770			if (comma)
(gdb) 
773			if ((n = strchr(p, '-')) != NULL) {
(gdb) 
804				hi = strtonum(p, 1, PORT_MAX, &errstr);
(gdb) 
805				if (errstr)
(gdb) 
806					errx(1, "port number %s: %s", errstr, p);
(gdb) p hi
$1 = 0
(gdb) p  p
$2 = 0xbffff61e "22"
(gdb) p errstr
$3 = 0xbffff494 "\b\366\377\277\024\366\377\277\036\366\377\277"
--------------

Weird...

I've created bug 694407 for this.