virtual dedicated server

I run 4 domains recently moved from dedicated to cheaper and more secure virtual dedicated server hosted at secureserver.net.
Pasted here is the output from top. What I'm thinking of is: Would it
hold to run 2 or 3 more domains on this server or should we not load
it with more domains?
The load seems to be low but I think maybe we need to use the memory
economically. A server with half the memory of this could not run more than 3 domain before admin gui didn't have enough memory and we don't want that to happen to this one.
Thanks
Niklas Rosencrantz

top - 21:23:23 up 11 days, 16 min,  2 users,  load average: 0.00, 0.00, 0.00
Tasks:  66 total,   1 running,  58 sleeping,   7 stopped,   0 zombie
Cpu(s):  0.0% us,  0.1% sy,  0.0% ni, 99.9% id,  0.0% wa,  0.0% hi,  0.0% si
Mem:   8140596k total,  8008248k used,   132348k free,    63532k buffers
Swap: 12578884k total,   803472k used, 11775412k free,   906724k cached
 
 PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
   1 root      16   0  2052  592  568 S    0  0.0   0:01.60 init
30644 root      16   0  3284  636  576 S    0  0.0   0:00.79 crond
31791 root      16   0  1728  612  524 S    0  0.0   0:02.82 syslogd
31872 root      18   0  5076  428  424 S    0  0.0   0:00.00 saslauthd
31873 root      18   0  5076  168  164 S    0  0.0   0:00.00 saslauthd
 7451 root      16   0  5316  756  660 S    0  0.0   0:03.25 sshd
 7494 root      16   0  291m 107m  14m S    0  1.4   2:22.32 java
 7660 root      18   0  2716  688  684 S    0  0.0   0:00.00 xinetd
25878 root      16   0  6612 1440 1360 S    0  0.0   0:01.04 master
26059 cyrus     16   0 10836 1804 1612 S    0  0.0   0:03.20 cyrus-master
26091 cyrus     16   0 30736  200  176 S    0  0.0   0:03.74 idled
26097 cyrus     18   0 32396 1764 1760 S    0  0.0   0:00.00 imapd
26098 cyrus     18   0 32096 1740 1736 S    0  0.0   0:00.00 pop3d
26099 cyrus     18   0 32096 1740 1736 S    0  0.0   0:00.00 pop3d
26108 cyrus     18   0 32096 1744 1736 S    0  0.0   0:00.00 pop3d
26120 cyrus     18   0 32096 1744 1736 S    0  0.0   0:00.00 pop3d
26134 root      16   0 30932  11m 2364 S    0  0.1   0:18.34 spamd
26175 root      16   0 32656  22m 1864 S    0  0.3   0:11.97 spamd
26176 root      16   0 31328  20m 1860 S    0  0.3   0:03.82 spamd
26208 mailman   16   0 10616 2860  996 S    0  0.0   0:00.02 python
26224 postfix   16   0  6740 1792 1436 S    0  0.0   0:00.56 nqmgr
26233 mailman   16   0 10736 6744 2604 S    0  0.1   0:13.57 python
26234 mailman   16   0 10728 6764 2604 S    0  0.1   0:14.17 python
26235 mailman   16   0 10736 6748 2604 S    0  0.1   0:14.21 python
26236 mailman   16   0 10732 6744 2604 S    0  0.1   0:13.77 python
26237 mailman   16   0 10732 6780 2604 S    0  0.1   0:14.45 python
26238 mailman   16   0 10736 6836 2604 S    0  0.1   0:13.95 python
26239 mailman   16   0 10732 6748 2604 S    0  0.1   0:14.70 python
26243 mailman   16   0 10732 6744 2604 S    0  0.1   0:00.13 python
26447 root      16   0  4696  392  244 S    0  0.0   0:00.02 vsftpd
28396 postgres  16   0 36804 2360 1928 S    0  0.0   0:00.37 postmaster
28400 postgres  16   0  8252  788  364 S    0  0.0   0:02.30 postmaster
28402 postgres  16   0 36804 1208  760 S    0  0.0   0:05.69 postmaster
28403 postgres  16   0  8252  800  368 S    0  0.0   0:01.24 postmaster
 5468 root      17   0  2528 1172 1008 S    0  0.0   0:00.00 mysqld_safe
 5543 mysql     16   0  138m  23m 5408 S    0  0.3   1:41.75 mysqld
 5829 cyrus     18   0 32396 2160 1752 S    0  0.0   0:00.00 imapd
 5830 cyrus     18   0 32396 2156 1748 S    0  0.0   0:00.00 imapd
 5831 cyrus     18   0 32396 2156 1748 S    0  0.0   0:00.00 imapd
 5832 cyrus     18   0 32396 2156 1748 S    0  0.0   0:00.00 imapd
 5833 cyrus     18   0 32396 2156 1748 S    0  0.0   0:00.00 imapd
17414 named     19   0 97844  31m 2104 S    0  0.4   0:04.09 named
32194 tomcat    16   0  349m 187m  41m S    0  2.4   2:51.42 java
29874 root      15   0  7940 2212 1800 S    0  0.0   0:00.72 sshd
29891 marketcr  16   0  8044 1340  928 S    0  0.0   0:03.49 sshd
29897 marketcr  15   0  2540 1396 1172 S    0  0.0   0:00.00 bash
30144 root      16   0  2824 1092  868 S    0  0.0   0:00.00 su
30148 root      15   0  2544 1472 1208 S    0  0.0   0:00.20 bash
32244 root      16   0 34128 7288 3888 T    0  0.1   0:00.10 emacs
30021 root      16   0 34176 7368 3916 T    0  0.1   0:00.16 emacs
31863 root      16   0 34360 7672 3872 T    0  0.1   0:00.55 emacs
28566 root      15   0 34336 7536 3852 T    0  0.1   0:00.10 emacs
28057 root      16   0 34328 7528 3852 T    0  0.1   0:00.11 emacs

JCE - added code tags
[ April 01, 2008: Message edited by: Joe Ess ]